Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ab82759ecae211…

MALICIOUS

PDF

57.4 KB Created: 2020-12-18 00:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a99989f94a3f44b75342413d34ae52a1 SHA-1: 2b6754cf01250d75803e7fb2100554a1f33bf9f4 SHA-256: a4ab82759ecae211d8b9f7d5f9b9986a702c3db7e60a01104db59954a4a55fc9
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, with a specific detection name indicating it's a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely part of the attack chain. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, consistent with spearphishing.

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://trafffi.ru/aws?utm_term=rational+expressions+division+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5f9ea9e09c604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f8f954f1b009.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/sevoga/vofumawawemomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdd8d0b-b8c3-4a2f-8e1e-9d9a44b85aee/davadivas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5a82d4-0cc4-4dfb-8323-fcc54d0544f1/70207600106.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/kejidoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f3c478-8db1-40f4-9d0b-994dd7f7a59e/kezewugajurelewizek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54ad5cd1e280355f12c83/t/5fc925d96fd9b263d7641813/1607017946566/48994855856.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcee2754809fd7eb9df18d4/t/5fd192558185f4776a07c1da/1607570005852/best_solo_tower_defence_warcraft_3.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/12605743981.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf1ae1af5bf52c326564c/1606218159539/27940101070.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_off0000a722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA722 5336 bytes
SHA-256: 95f3004eca5cea373bf6d39dcbf26233ca2775781788c07163613743b2356b7f
font_01_sfnt_off0000b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 9388 bytes
SHA-256: 5c04989c386215532b8fdc581a101361a112eea22a7c99564c7c3a112941c02d