Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10c824c2980d956…

MALICIOUS

PDF

38.9 KB Created: 2021-09-21 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79ce9cfb929cfd95390ef9049a36cab6 SHA-1: 76ae219b87cbd28b0262825088eb087fa4c75695 SHA-256: f10c824c2980d9564d7ba6547194710341522edc84f8772b06d7e78fd01bbaaa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's purpose is to redirect users to external, potentially malicious, sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7077

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://coretry.ru/uplcv?utm_term=simcity+cheats+android PDF link annotation
    • http://fixafilm.se/userfiles/file/pemilawukepixese.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/xegoxotasonanenolubuvaf.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/37493971168.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/59109281685.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/15558071657.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/87531487566.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/guwojinug.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/1409874763.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/73796398227.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/gusigaresolaluvubonuzamo.pdfIn PDF document text

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