Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecd61056f046ad8…

MALICIOUS

PDF

55.9 KB Created: 2021-02-03 00:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c76839b331b2448e0d4cfc7b328196a6 SHA-1: bd5ef4ca2f1815fc6a63b393e24ff9ddb628f6ab SHA-256: 4ecd61056f046ad8981860f7075e82454a72b1882ea58eec0f849f90079915d2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination or to leverage SEO tactics for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8553

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://druttle.ru/aws?utm_term=binary+stl+file
    • http://vorecan.fun/92164013610clpvz.pdf
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/97514.pdf
    • http://vsedlyatebya.xyz/52839154762uohjg.pdf
    • http://armada.technology/simple_past_tense_grammarlie5w.pdf
    • https://cdn.sqhk.co/pobumepova/jbYhePQ/23995183395.pdf
    • http://card2card-perevod24.site/under_the_double_eaglehwqff.pdf
    • http://upgrade4me.com/43333266205w1ra1.pdf
    • http://4kuhd.me/notulekudilinegojasiwo8qao.pdf
    • https://s3.amazonaws.com/vajefam/nifuramunuro.pdf
    • https://s3.amazonaws.com/fujadabez/6791319776.pdf
    • https://s3.amazonaws.com/gogoxowiniza/design_patterns_in_swift_5.pdf
    • https://s3.amazonaws.com/perurulexi/leesville_lake_ohio_fishing_report_2019.pdf
    • http://bexalaxawuwe.rf.gd/40197507074.pdf

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