Malicious PDF — malware analysis report

Static analysis result for SHA-256 39281a1e8cb06b3b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 06:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4d07bb3b081c0b3326fc345c1c962b SHA-1: bd0dd0e7edfe6123caaab363df6fec5b472f99d6 SHA-256: 39281a1e8cb06b3b4dd1e9d3b80298f91b5c7d560a17c900935dd031c30e5a86
126 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 numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malicious redirection intent. No scripts were extracted, but the presence of many external links suggests the primary attack vector is redirection to potentially malicious sites.

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://kuzutuzo.ru/strik?utm_term=evenflo+tribute+lx+convertible+car+seat+weight+limit
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/46065.pdf
    • https://static.s123-cdn-static.com/uploads/4368242/normal_60066e196bc62.pdf
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/d9126.pdf
    • https://static.s123-cdn-static.com/uploads/4369160/normal_5fff79c9bb5c5.pdf
    • http://zebiripu.mygamesonline.org/16191275557.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd8fc116079f.pdf
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/8436138.pdf
    • https://cdn.sqhk.co/kufalavoxig/yWjhNhi/vabosagefeno.pdf
    • http://gagogepatajebe.medianewsonline.com/85078596650.pdf
    • https://cdn-cms.f-static.net/uploads/4419818/normal_601572314ac8b.pdf
    • https://cdn.sqhk.co/xafeperale/bgdbibT/diguxiginoduga.pdf
    • https://static.s123-cdn-static.com/uploads/4421213/normal_6008c3345120c.pdf
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/gusekuzudovirot.pdf
    • https://cdn-cms.f-static.net/uploads/4450514/normal_6026a99983c2a.pdf
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/kidinodej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wizigipixe.atwebpages.com/economist_december_2020.pdf
    • http://vimomata.rf.gd/fiwusafobolokazugem.pdf
    • http://gikuxedikejoba.epizy.com/mcgraw_hill_4th_grade_math_book.pdf
    • http://kitijowu.rf.gd/80371552714.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_off0000ea90.bin
25dbd24eb05bb317455d59e2ccc8bf38997c270477b38527973eb757c05ecf01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 5612 bytes
font_01_sfnt_off0000fd9e.bin
3c0b34c11e48a9964cf0e4fcd0d5554ff81203abda4d81f2e9cb99012ef07dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10644 bytes

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