Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd50fa181f637c61…

MALICIOUS

PDF

58.0 KB Created: 2020-12-19 00:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b55ef546a5153d4a595fa3d4b07c2392 SHA-1: bbcea0f792b8d4102b30ff59eb0ba1735214233a SHA-256: fd50fa181f637c6162d06669f5769698bbe50341ce5836b9d060bb74739cd2d1
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffine.ru', which is likely part of a phishing lure. The document body, though heavily obfuscated, contains text related to 'Astronomy today 8th edition pdf free', suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=astronomy+today+8th+edition+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd635afbf211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fc67dc722d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f900a17cf89c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_5fb602da85af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_5fd78cc647dc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fc5317c6173c.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/5fbe066dfa04221c71e7a41c/1606289006599/30082357464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d852821d-2f06-4eb6-acf0-6d45f68ccf82/yamaha_yst_sw216_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/67197968788.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/agent_jason_gideon.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/basic_computer_gk_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/9706934736.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_off0000a6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6AD 5536 bytes
SHA-256: 15887937f1bca61d846300719f6512384c418051f959452489016c3fd8ffcf2e
font_01_sfnt_off0000b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 9964 bytes
SHA-256: f18c186c6bc0ed70f3473027a12765efc6cf769fad36868842b7b1878b9b6d6c