Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6515b057c2da7e…

MALICIOUS

PDF

206.2 KB Created: 2020-12-11 08:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 04bc7bf0507d8dd1675f11938bcb8d14 SHA-1: d212e0e54b0e77666f53c5436328612ecc43da24 SHA-256: 7c6515b057c2da7ef8d3ab9f9a17f0fbd3a329dff625d8b6976c6a5fa237ac78
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. Heuristics for urgency, invoice, and callback lures, combined with an embedded external URI, suggest a phishing or scam campaign. Although no scripts were extracted, the PDF structure and embedded URI point towards a likely attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://trafffe.ru/aws?utm_term=19+cfr+10.+103+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f888cd6a4ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fa4bb3a39449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fbd87c63daab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f8db0ed5329d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fc137dadc731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcffbcedabee7b4407c749/1606221756118/vanuvufolewaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/nightjohn_free_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/9192986358.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/salvation_by_langston_hughes_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/pidekizofomibiwajaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/boombox_jbl_user_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC9A 5060 bytes
SHA-256: 429dc935f771b5a90609a255b2014532df06197b5359ebdd5e6cf2e537ae5a02
font_01_sfnt_off0002fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDCB 14112 bytes
SHA-256: 2d9d69201b17629d15a82c0d52a3e611efa25b17a1fef040d9ebb961ee158bb5

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