GridinSoft Threat Intelligence
zlib.dll file report
Why it matters
Evidence available for this file
No final classification is available yet.
First seen 2025-06-16 23:01:08 (11 months ago); latest analysis 2025-06-16 23:01:12 (11 months ago).
Company metadata: ©2023 Sogou.com Inc.All rights reserved.. Product metadata: PDF 阅读器.
Signed by Beijing Sogou Technology Development Co., Ltd.. The signature is reported as valid, but signed files can still be bundled or abused.
ThreatInfo has seen this file in user or system paths listed below. Unexpected locations increase the need for local verification.
Recommended action
What to do next
- Use the hash and metadata below to verify the exact file identity.
- Review publisher, signature, paths, and PE details for inconsistencies.
- Run a local scan if the file appears unexpectedly or starts with Windows.
File context
zlib.dll is a Windows file recorded in the ThreatInfo database. It is associated with PDF 阅读器. The reported company name is ©2023 Sogou.com Inc.All rights reserved.. The current detection status is Undefined, based on the latest analysis from 2025-06-16 23:01:12 (11 months ago).
ThreatInfo does not have a final classification for this file yet. Use the technical details below to compare the hash, size, signature, and observed locations with the copy found on your device.
File Details
| Product Name: | PDF 阅读器 |
| Company Name: | ©2023 Sogou.com Inc.All rights reserved. |
| MD5: | 55e79c45a24d5988b6946cf4d0f32c16 |
| Size: | 114 KB |
| First Published: | 2025-06-16 23:01:08 (11 months ago) |
| Latest Published: | 2025-06-16 23:01:12 (11 months ago) |
| Status: | Undefined (on last analysis) | |
| Analysis Date: | 2025-06-16 23:01:12 (11 months ago) |
Overview
| Signed By: | Beijing Sogou Technology Development Co., Ltd. |
| Status: | Valid |
The signature on zlib.dll is reported as valid. A valid signature helps confirm publisher identity, but it does not automatically make the file safe if the installer was bundled, abused, or downloaded from an untrusted source.
Common Places:
| %localappdata%\sogoupdf\ktool_update\kdownload |
| %localappdata% |
ThreatInfo has observed zlib.dll in the locations listed above. Files found in temporary folders, user profile folders, startup locations, or unusual application directories should be reviewed more carefully than files installed under a known program directory.
Geographic signal
Observed country distribution
ThreatInfo has seen zlib.dll across 1 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is United States with 100.0% of observed hits. Geographic distribution can help identify targeted campaigns, regional software bundles, or where a file is most commonly reported.
OS Version:
The most common operating system signal for zlib.dll is Windows 10 with 100.0% of observed hits. If your system differs from the common profile, check whether the file was introduced by a specific installer, archive, or removable device.
Analysis
zlib.dll is identified as pe for 32-bit systems. The subsystem is Windows CUI. PE header values are useful for triage, especially when they do not match the expected publisher, product, or release timeline.
PE Sections:
Section layout highlights raw-size concentration, repeated names, packer markers, and hashes that can be compared across related samples.
f6dde5968d5f1ddfe04e29d202179b09
9de05fa030eb1c15787c33a2415d3046
30bde08b797cb19ceefc37edb3e25763
214a5ddb2998e186c7f3a2e920938eab
7d8d391bf9bb3cedbb5507d78f7aedf7
aa7458aa4f8e11e43dc328cc1c4477c6
PE section names and hashes can reveal packing, injected resources, or unusual build artifacts. Sections with uncommon names, very large raw data, or hashes that differ from a trusted copy deserve additional review.
Report conclusion
This file is still under review
ThreatInfo has not assigned a final verdict yet. Compare the file hash, location, signature, and publisher before trusting the file on a production system.