Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea6f3c3d9f4a624…

MALICIOUS

PDF

70.8 KB Created: 2021-03-05 18:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a060dbc0ed477f53ce7842cabd858735 SHA-1: 3ab96b90d13bf1098bb83880ddfed9677624463a SHA-256: fea6f3c3d9f4a624fe7663878a2f30fef107e1640e17a7aa4aff0c6509d806d3
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('vilenefex.ru') that is likely used to host malicious content or facilitate phishing. The document body, though heavily obfuscated, appears to be a lure related to sheet music, designed to trick users into clicking the embedded links.

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 https://vilenefex.ru/aws?utm_term=moon+river+violin+sheet+music+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501027/normal_603e73dc3e577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_6037aaac3d105.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/why_does_my_mr_heater_big_buddy_keeps_shutting_off3a3i8.pdfIn PDF document text
    • http://tramlaweq.online/french_revolution_essayrdlug.pdfIn PDF document text
    • http://usacarins.com/vibraciones_mecanicas_ejercicios_resxxj35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_6027dca765699.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/jjjchjx/enchanted_garden_gazing_ball_stands.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/how_to_write_a_reflective_essay_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/igggif0/tomah_wisconsin_tractor_pull_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gevolonovare/6SjiKR0/45015092718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6026f9f5e21b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jeiiifD/loborakujelorim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb892eb-1857-49d5-808a-250c2b209556/69337524697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79d49a2-3876-499d-812d-b142fd6a6ef4/how_to_make_a_good_class_president_speech.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/schumacher_xp2260_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e7a3ca-da89-4abd-8252-48e72ef4e60b/nenodipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f921dfb2-343c-406d-b141-f632e04f60e1/fesuramevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a30ba4-6a75-4965-be01-48ada43a5b6d/12319839926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539df73e-5ad7-4cc8-b2c8-e09512ff1d90/joxejabimuvuxirod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d182e549-3d37-4947-8c25-e1ce18669241/fight_club_2006_mp3_download.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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 5204 bytes
SHA-256: 55538de05a0826569dfffca57e3138f7007c988aff92347f24672385a8c49b54
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 11468 bytes
SHA-256: 94ad599c41050f1165fc62b36bb96c23c3c6b8304a40cccba4ef9d7455f66270

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