Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e87bd3cde8779…

MALICIOUS

PDF

71.2 KB Created: 2020-12-21 03:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 66f5dd1cb9df5cfa924e8b87063d67b1 SHA-1: eda7cd15e76fd3ab8b774164f1fd3d2e95684f33 SHA-256: 4a1e87bd3cde8779a19b6b7d15f79e1af3f4426cf160071ddefe8d46b20ea108
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('trafffe.ru') that is likely part of a phishing or scam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=withings+watch+battery+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fa2f56b83b81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fcfacfba7147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fd087ad394a3.pdfIn PDF document text
    • https://wefanuku.weebly.com/uploads/1/3/4/6/134611064/juninitoziloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f89402c71d44.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/retisovojor/tuk_tuk_rickshaw_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658779a5-2ba9-4549-8998-04924eb4b2d4/ruxixesadarovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dac2754-9ab2-4b60-8484-73aa493b3173/all_squares_are_rectangles_in_symbolic_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd131452f90b7fe52ecb/t/5fc15e0e3485235c86fa1cf8/1606508047638/german_christmas_pyramid_kit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b9656b97992eb57c9820/t/5fd68b86102ca46975e9a3a0/1607895943544/77662666013.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2b2255b18a2b82c09c96/t/5fddd6f6f11f517dbbb5cbd7/1608374006777/33662326238.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2c3cb0b7d26d496ab432/t/5fdd83f0f5f6422656344844/1608352752413/human_body_system_questions_and_answers.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 5696 bytes
SHA-256: c6197d20154575331d7edef4c7bd3b853fe7c6d54170a5d2ebf0b9cabc4fd1e3
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 9948 bytes
SHA-256: 02ec1e1fc118aa6ed712950183f40231e7ab3ea9e3ce1634eae8e3541fdfbc89

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