Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1538e0204d2658…

MALICIOUS

PDF

61.3 KB Created: 2021-03-14 01:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: efe4bb6c309e8935cf929f812bc62579 SHA-1: 0f5e326aba32bd46f614a35f12648887a8a65117 SHA-256: 5c1538e0204d265801435cff1e5e68e0909a91afb465f2607a8c4319321cd70e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and heuristic firings indicate this PDF is classified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

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 https://midufefew.ru/award?keyword=download+pdf+file+from+linkedin PDF link annotation
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    • https://cdn-cms.f-static.net/uploads/4406241/normal_602a58f9333f2.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/egVjjDo/politics_and_the_english_language_four_questions.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/94102995752.pdfIn PDF document text
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