Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda156abbb944009…

MALICIOUS

PDF

44.2 KB Created: 2021-09-13 13:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 551fc194054b84b5860be94698fd8c20 SHA-1: d1a4cccb1e59b3d0f24b7f987e20461e0f4825c0 SHA-256: bda156abbb94400983d1d4a86828a6440bcffbf845470f91a97f8ed9786f429d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7976

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://wastran.ru/uplcv?utm_term=convert+feet+to+radians PDF link annotation
    • https://n-v-v.dk/userfiles/file/60877290040.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1ff349d1---depixano.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/2435821378.pdfIn PDF document text
    • https://brod-plovdiv.com/images/muvisavurofo.pdfIn PDF document text
    • http://pi-consulting.ch/download/mojinoxo.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210913151745.pdfIn PDF document text
    • https://5uempat.com/contents/files/88906365939.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kesatadosomobo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/49752801659.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/64216052068.pdfIn PDF document text
    • http://sayarbobinaj.com/file/27787444844.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/23012041398.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/fosefofavinom.pdfIn PDF document text
    • http://spbi.cz/res/file/84833550104.pdfIn PDF document text

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