Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25079892bd2d79…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 10:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9fefa9247102016a0da421992ed3a8bd SHA-1: e6aaee655b01b883720cd0fe9e24f58ae383abc5 SHA-256: 3e25079892bd2d79e43246ccd26d816c6179651344a0da75c9216e8710f66b72
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=samsung+ml-2165w+troubleshooting PDF link annotation
    • http://dubiniba.iblogger.org/grimstroke_guide_dota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_604e227a34ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/Gufijij/rozulitopimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_60501c99b975f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_60552ea0e95ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_604b5158e4008.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/hng5rEZ/21000173531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_604e54caa1fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6038b532146cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5ff409de6ed73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_603efe7412c74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refawolasuwibi.epizy.com/tapumezaraxamew.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b5dce17e79e5425c84dfaad29d54c628.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_948ee1ccbccf428a85ff5a5847b8b50d.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_691bbc4fc46945569933a03ddac2b905.pdf?index=trueIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_cf8124d2f85943b7b8516e0d01a30ea4.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_8da0cf09efa548a09a7a54939051853f.pdf?index=trueIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_5082060ec2164c20b1751fd780d9e62c.pdf?index=trueIn PDF document text
    • http://tilawiveso.rf.gd/how_to_fix_a_lawn_mower_pull_cord.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5928 bytes
SHA-256: eb5d300754fde48d527ac5315a41d24f084718a5e4af0a8fcf9d5b08c85a1b92
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 12052 bytes
SHA-256: 3c0f5656df420da7d3934534f8c090bcf2f988495cfc72439e513929869fb00d

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