Malicious PDF — malware analysis report

Static analysis result for SHA-256 262a4529eec195a6…

MALICIOUS

PDF

80.2 KB Created: 2021-04-22 11:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f432ca2ead34021b037b7f9f5d59a3 SHA-1: 7195b6b83058179e12be46bdfa516c14f4be4340 SHA-256: 262a4529eec195a68b7fcb603b6de237b74c8a503b5c01f54127b8676c4485b5
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful content.

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://dafemum.ru/strik?utm_term=how+to+practice+ashtanga+yoga
    • https://letonezesuju.weebly.com/uploads/1/3/1/3/131383444/175218.pdf
    • http://usacreditscore.info/25649090739y2rr9.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_601cb18b321d6.pdf
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/90182f5d9e2.pdf
    • http://stingeksoj.online/livro_adestramento_de_cesy3qab.pdf
    • https://sexaximelukifa.weebly.com/uploads/1/3/1/0/131069869/7586641.pdf
    • http://ompala.store/retetomavok39jmk.pdf
    • http://fomijegi.mypressonline.com/90837031935.pdf
    • http://azalea.store/75531458463rqwp9.pdf
    • http://boguzimaro.getenjoyment.net/doreruro.pdf
    • http://lnstagramverifiedbadge-media.com/addition_et_soustraction_des_nombres2poie.pdf
    • https://cdn-cms.f-static.net/uploads/4476946/normal_601c62feb8334.pdf
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/ferifufotinemof.pdf
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/04d04b54c2835d7.pdf
    • https://cdn-cms.f-static.net/uploads/4460058/normal_605effbb6d3d7.pdf
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/444811.pdf
    • http://tepifugamokeg.medianewsonline.com/9mm_sig_sauer_p938_vs_p238.pdf
    • http://sipipewawezizuf.getenjoyment.net/bowubavakokexalapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sadamalaju.epizy.com/jivepanetobusegiwusodovok.pdf
    • http://newoponaz.rf.gd/psychology_test_questions_and_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9b.bin
fa8b281586ffbd769c58be6845fb07c5e6593359a0d611dcf8df4481115a8670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 5316 bytes
font_01_sfnt_off00010fc2.bin
40552c3c48aa675f95bd0a391a971906ef1bbc1913c2a72ada8ed17e5cd6e7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 10648 bytes

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