Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2461b290e9949a…

MALICIOUS

PDF

80.1 KB Created: 2020-11-20 18:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1107a9c80bfa3bd71a2059bb91423896 SHA-1: 1f0505c7f593ada6ad9b6a994ebf6e7edb428e34 SHA-256: 4d2461b290e9949a03946389be0ae32a477d544d08640a5e9564382dc42927ee
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to 'trafffe.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=terzaghi+equation+for+cohesionless+soil PDF link annotation
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/nidasofusudikapada.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/5524919.pdfIn PDF document text
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/5606578.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/jigam.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/xegupof-pajun-wemimimof.pdfIn PDF document text
    • https://likixulojuxe.weebly.com/uploads/1/3/4/3/134386003/dakuradejo_jiwiwugotonu_mopowaz_warej.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/kavitokolezub/varilogitofiji.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/cute_panda_pictures_to_color_and_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdb52ac-6489-4959-b3f7-bdb548c48e9a/bimaja.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/finding_x_calculator.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_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 5268 bytes
SHA-256: 1f78d73a75bba2de4385f19241de34d2a627f293087730fe9b23214e4952fbba
font_01_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 11460 bytes
SHA-256: d88f0944d6e8d0189ad87edd61f3034d7f7c3b15c63b8c7d10a2502dda51b2ad

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