Malicious PDF — malware analysis report

Static analysis result for SHA-256 905643812f73c5ce…

MALICIOUS

PDF

57.2 KB Created: 2020-12-18 04:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ef436b65c814d2ef718a03ffc516b1e9 SHA-1: ed3540e24bee4ef52beb3a5551829e28d8e8b448 SHA-256: 905643812f73c5ce23c58502d6386a891a5d7175f84db80133b147e8a6540622
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, with a specific detection name 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to 'https://trafffi.ru/aws?utm_term=arjun+bijlani+photo', which is likely part of a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' suggests an attempt to obscure malicious intent through a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=arjun+bijlani+photo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f8fc7288df78.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/dunubazowebutuzoj.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/abef22d064547.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/5fc0052111f6a4198480c96b/t/5fcbc8206e74d26c6f07d2f1/1607190560462/wonder_weeks_leap_1_not_sleeping.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/2007_jeep_grand_cherokee_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425b5154-4385-4b40-8d3a-7503707f8cfb/army_enlisted_ranks_1955.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/zemojakeragon.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/articulate_community_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f5a46a-d796-4b10-b693-f79c925364bc/89121794289.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/dawemonilimitekerije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252c192f-5096-458e-8da9-2385f48f9726/midnight_summer_dream_summary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfc75ef3361272aec2a8f/1606220919370/95376221150.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_off0000a66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA66F 4932 bytes
SHA-256: 6a00ebc21b17263a9012f1500b90ea484f514d9799f87ff2c11f49379c5ff984
font_01_sfnt_off0000b72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 9608 bytes
SHA-256: c03242ed9874470b2afbabadb9b1b6beabb410eb2843a16d689cb20db03922fa

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