Malicious PDF — malware analysis report

Static analysis result for SHA-256 6526f98bcc7e884c…

MALICIOUS

PDF

67.6 KB Created: 2021-01-13 20:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 37edc1da24efe668c56654e2e6754016 SHA-1: 84e6d6407ec6f043eaedf18256e510024458398c SHA-256: 6526f98bcc7e884c9bfb434eb47af0604a4f817c77c007791030ed5ff877590a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with a high risk score. It contains an embedded URI pointing to 'trafffe.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'the landlady activities pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://trafffe.ru/123?utm_term=the+landlady+activities+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5fb2797dd2822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5fde8ff56dcb1.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/ihejogg/98278643614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fbdeb51a3955.pdfIn PDF document text
    • https://site-1241869.mozfiles.com/files/1241869/mafosonajux.pdfIn PDF document text
    • https://site-1179820.mozfiles.com/files/1179820/6392076100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd7c99752dfa.pdfIn PDF document text
    • https://site-1171720.mozfiles.com/files/1171720/black_friday_black_friday_walmart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/lebupunof.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_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 5260 bytes
SHA-256: 3d1ddf2b4d39ae5ec83d2e2b0f9ad430a064fabda0233f343801fd625175c717
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 11176 bytes
SHA-256: c4642e73334dc491863cd3dd948a1b691dfd15c66db3a4f1ad8ed24dc1c1a402

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