Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb50a9f81ea63c7d…

MALICIOUS

PDF

58.4 KB Created: 2021-04-02 05:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 32275fc420891407df701a238b2575f5 SHA-1: 0e97352e58d76031fb6b9c166b9d96c8787fe9c7 SHA-256: cb50a9f81ea63c7df3043319c8a5315da0d6a5f7b6df237f65764e1429679b80
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6238

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://leonvi.ru/aws?utm_term=sc300+ls+swap+headers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601f551174704.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/ihaejiH/masevewazezonigeruxonuf.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/dhdjfji/ap_grama_sachivalayam_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fe369e289752.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/78194786433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446915/normal_5fdfaeb784579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_605955e333aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_60509e4130184.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
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