Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d09474ea0a836e4…

MALICIOUS

PDF

74.3 KB Created: 2021-02-22 14:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f48e0fa124ec278522a08634912dfed SHA-1: 44ae93973a06c224e7d425405b886bd845199698 SHA-256: 8d09474ea0a836e41003dee453487fa3021cccc67550679fe5753b7e7a18ca5b
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though truncated, suggests a lure related to technical instructions, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/wb?keyword=how%20to%20reboot%20a%20cisco%20router%20from%20command%20line PDF link annotation
    • http://site-shop.xyz/arquitectura_del_barrocotn0z9.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/gjsNHrz/26175088917.pdfIn PDF document text
    • http://gramnews.xyz/pijapesaxuwejukuvlm6r.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/h3gfibG/best_mini_dash_cam_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60337a03ce82d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_6005e5a91b699.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/dH6phbe/weed_leaf_outline_small.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_601774ac1ae46.pdfIn PDF document text
    • http://alex-chekalev.com/98903003447ksdw4.pdfIn PDF document text
    • http://fitokapss.xyz/parts_of_speech_notes89577.pdfIn PDF document text
    • http://tizezs.xyz/378076832203cxfj.pdfIn PDF document text
    • http://euroshopmn.space/bamikixisigiworubezazaurng6.pdfIn PDF document text
    • http://bristol-yalta.run/91024671716mn5ru.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/crio_9068_user_manualdjliy.pdfIn PDF document text
    • http://porn77.design/laser_treatment_for_cervical_cancer687wa.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/igh1LPD/lisebevose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5360 bytes
SHA-256: 96c7aa0e593db7e1b339ce2b9afd223d17fc163685671ca7b8f3341271a66780
font_01_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 11000 bytes
SHA-256: 4e7f415a4a291cbf15264d91366bc92cbb5770d42a8e51c4b68b6585da0cc793

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