Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1784db21e06094e…

MALICIOUS

PDF

69.6 KB Created: 2020-12-20 10:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 786519240cb30caee36f4b375e3aa63b SHA-1: 177fae979f65e06c061a933e2a17fde30e2368f2 SHA-256: f1784db21e06094e62e2342b4d8ce2055b0ad28fb7c603b07fadfa51d391a38b
136 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'skid loader price guide'. No scripts were extracted, but the presence of external URIs and the ML/AV detections strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/strik?utm_term=skid+loader+price+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fba4573a69da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd64735f2977.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/3cde25ae-b1d2-4faf-8123-32285fdff536/ordinal_numbers_in_spanish_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf48c3c02f22b9dd2abb6/1606284428844/picnic_clip_art_black_and_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1764085-9109-4c81-8b11-b989978ab667/loralunidilosesuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d3e29b-0bc5-4141-ac8c-921a17349c2b/tupebixevalumuwalukenew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bbab6f-6d0a-4d00-a4fb-ac40c6355a58/pro_beauty_tools_iridescent_curling_iron_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18972fad-593f-4cd4-b36f-9c422df4260e/sexitufawumexeroropu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fed7d28-d29e-459e-9832-a7215bb715b6/razuzarojirajadap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf5478bc8713fe6fd0bce/1606219079979/37615527854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee991fc-70ab-4f84-be28-03450a5c26d6/ess_sistemas_de_informacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c02f6e-0770-405b-b27c-88338640ae3d/wisixi.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
    • https://uploads.strikinglycdn.com/fIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 5232 bytes
SHA-256: 4ac083de3051b7d09322fb5f69f6fb20f99b62c40612afea5b5481832e1fd741
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10844 bytes
SHA-256: 187ea59fe24338ff9b63e0adefce7fc66f30672ed098a5d95a67f6dadabe62b4

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