Malicious PDF — malware analysis report

Static analysis result for SHA-256 c793c668e7587c4c…

MALICIOUS

PDF

68.1 KB Created: 2020-12-18 15:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5799fe6614161731e11fab92d490da47 SHA-1: e7b1fcd4dc7d48f888ffc2632b6a5a7ba3e8662d SHA-256: c793c668e7587c4cdeb154bc6e5940f8038dbddbde413b6ff6104a8545cf39e4
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URL pointing to 'traffine.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to calculus, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffine.ru/strik?utm_term=average+and+instantaneous+velocity+calculus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fc48b965f705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5fc4401225145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5fceb304305b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fb8edc2c6045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fa85ff99846d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5fb4316aeb92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f91a1ff567f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_5fb853e145b61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b63a6b-ebfd-49bd-9655-5f05d5cf3f5d/reweris.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51f2860f2895dc10325ef/t/5fd1163e312491467eda0e0b/1607538238379/bazugigosuzebezirab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1057cc30a162e0c5324ce/t/5fc51ad33c6ccf69f30158ca/1606752979794/73977531538.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6ba65147b148042bc07c/1606380457015/suguzeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce08ca41ec4a2cc0e05485/t/5fce51dcf94b6402b24a7aa6/1607356893011/mevinodibilelada.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_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 5256 bytes
SHA-256: 63f18555bea22327da6fabeb30026210f2dba01c83698e444ff9fc6aa124a121
font_01_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10748 bytes
SHA-256: 1c75e8140e5e64833e4e867ed1892d8c82d1f7290fbf255f9caf840f7c67f82c

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