Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9d6154f42ff4e3…

MALICIOUS

PDF

80.1 KB Created: 2021-02-17 17:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4f33452f3ad590e7b0866dd33673f486 SHA-1: 2f30ddf7f558a54ca3dd9df7f2a905aa1479e3be SHA-256: de9d6154f42ff4e36cbcfb97553460386732d7a0788325aa9f535282547e0fec
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=bissell+proheat+pet+troubleshooting+no+spray PDF link annotation
    • https://cdn.sqhk.co/fivuwunar/LwXih7x/fox_world_travel_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/jbBhhib/xitibajemiwedexebugafaf.pdfIn PDF document text
    • http://lirerigoteses.22web.org/cartoon_network_adventure_time_card_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/gcaYyib/woditoveg.pdfIn PDF document text
    • http://naturagrush.space/donijav3a9lm.pdfIn PDF document text
    • http://gutemelav.22web.org/nokegijav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitogopafo.epizy.com/jodijowekiperigavodo.pdfIn PDF document text
    • http://supovopekowo.epizy.com/metaphysical_poetry_definition.pdfIn PDF document text
    • http://zifemibenuf.epizy.com/66190106198.pdfIn PDF document text
    • http://menimilerawapo.rf.gd/adventure_of_tintin_mali_apk.pdfIn PDF document text
    • http://suvapik.epizy.com/catia_v5_tutorial_free.pdfIn PDF document text
    • http://mutidulofof.epizy.com/devils_bible_in_malayalam.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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 5372 bytes
SHA-256: 610a9a57d493469d7cc153cf036490f145a9a2a473fbe124489c50503f520ba2
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10584 bytes
SHA-256: 329d44184bba5402795236ba358ffec2c1b0f8a285b052d07aa98b4aa842f619

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