Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c9eb526ae45775…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 15:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 83862e27031ac0ee8700c75a2bf0cb92 SHA-1: 0a558d66957788404f8682876ecb6c9054ddbebb SHA-256: 42c9eb526ae45775c9a7a748be5c3930cfc16427e0a51aebf9016c3083616ef4
126 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 numerous embedded URLs, many of which point to disposable domains and are structured to appear as downloadable PDF documents, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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 http://trysoda.pro/jibogolizitegipikokiwageq9tx2.pdf In PDF document text
    • http://remont-kvartir-otzyvy.moscow/36152646529m9cdd.pdfIn PDF document text
    • https://suxobiras.weebly.com/uploads/1/3/4/6/134614615/6596284.pdfIn PDF document text
    • http://gmetry.online/briefing_synonym_auf_deutschr1u2w.pdfIn PDF document text
    • http://interior.estate/besasozagaxiwusorisidomeg85otc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd7de87c8edb.pdfIn PDF document text
    • http://leoidet.xyz/72711460320dz25n.pdfIn PDF document text
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/xadapanuligi.pdfIn PDF document text
    • http://fasad-dom.site/audi_s4_avant_used_carskj079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_5fe498a5edd92.pdfIn PDF document text
    • http://eurostore.info/jurifupiripivogrcxaq.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://ca-management.website/firusudafeneruxevowufipqxjzn.pdfIn PDF document text
    • http://csxmoney.info/hp_z420_driver_pack_windows_10fim8z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=how%20to%20make%20a%20mind%20map%20for%20studyingPDF link annotation
    • http://vapedefomagejev.epizy.com/xopijetiveni.pdfIn PDF document text
    • http://bizujexexo.epizy.com/jafulisufafujasenebi.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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 5548 bytes
SHA-256: 5e6f80431733fc4cda5716eedd38d4038c3e37f959d8a39c8636a93f154d58bb
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 10676 bytes
SHA-256: 6a05b4b49749c89916594ec8e4c81a9cf57f2352dbef0c93dfe6d79389448418

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