Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d3feb28a883953…

MALICIOUS

PDF

47.8 KB Created: 2021-09-14 07:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c437b16df98ec60ad3d9fe5b14d29e22 SHA-1: 21a146de6d4a87b0d5d1dbb0a93de4d5784c9d0d SHA-256: 90d3feb28a8839534f10920993710f2116d9478b65f90e6c3d15086c429ea949
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple external URIs. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ClamAV detection strongly suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4722

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=camera+save+to+sd+card+android PDF link annotation
    • https://hotel-la-licorne.fr/userfiles/file/33388323172.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/ludigimab.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46425906764.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/1132843172.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/793323648.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tusavaralagedagaxowabotok.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/07945eeb77e653ae0d6ca2af63ba393a/xabet.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/najawojeluzimipo.pdfIn PDF document text

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