Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c95c9ac4378f83…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 06:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 00139e2508e811e2a194c4eddba23065 SHA-1: b73d82b98ed334d1f8a2f32616881922ad0b2d63 SHA-256: b6c95c9ac4378f8321fc0f41b47e44ba52e86d7e7ad63de7c91877702f636aa3
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=platero+y+yo+resumen+para+ni%25C3%25B1os PDF link annotation
    • http://nigavereke.mygamesonline.org/convert_musicxml_to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_600c450121847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fcedcd595f86.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/hopper_reset_button.pdfIn PDF document text
    • http://freedate18.xyz/what_is_the_recovery_time_for_gum_surgery183pe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fc8b79515ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_602f605512215.pdfIn PDF document text
    • http://comforfemj.fun/762233363550a47j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fe60053a3e2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5ffdefd3db1b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/fresher_resume_template_in_ms_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/vetoza.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/rezamugesom.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/21660892201.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/zokemugela.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/patikeloli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 5160 bytes
SHA-256: 31841739d78244b23ad5d08cc2e3f8eda1bf50da376fdc423d407059a08bc619
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 11752 bytes
SHA-256: e3c49b34d13add77b4609c9399dd4e4cb1546c78444b4570900d3c9d26a59f6a
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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