Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c87de802f52462…

MALICIOUS

PDF

53.0 KB Created: 2021-04-10 16:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 735da0590cf5870aea75d3f7248dfb47 SHA-1: 75a06b71efe63cc7547052eae22417ca743e67d7 SHA-256: 91c87de802f5246208c7153ad83ad3c6120bf4f95bff955dd2ee4848d24fedf8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded links, many pointing to disposable domains, and is structured as a link farm. The document body, though heavily obfuscated, suggests a lure related to "Warhammer 8th edition rules summary" to encourage users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6427

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pilgrimland.com/sites/default/files/webform/resume-uploads/40494538869.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/34904816646.pdf
    • http://seiary.com/sites/default/files/webform/rec/6045441545.pdf
    • https://ambrose.edu/sites/default/files/webform/58234525485.pdf
    • https://architecturaldesigninc.com/sites/default/files/72694480293.pdf
    • https://www.mainephilanthropy.org/sites/default/files/50588642306.pdf
    • https://www.jwico.com/sites/default/files/webform/kupoxogij.pdf
    • https://europa-ts.ru/sites/default/files/webform/totikejeropisatuzubafaba.pdf
    • https://ambrose.edu/sites/default/files/webform/mamak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=warhammer+8th+edition+rules+summary
    • https://printandmail.princeton.edu/system/files/webform/50156150340.pdf
    • https://printandmail.princeton.edu/system/files/webform/60959229638.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/33404153997.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/gijewosatesozug.pdf
    • https://gradfutures.princeton.edu/system/files/webform/ninavixokamorul.pdf
    • https://lib.asu.edu/system/files/webform/98562832035.pdf

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