Malicious PDF — malware analysis report

Static analysis result for SHA-256 16feea0df9bfed9f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-25 14:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e09ff5018c5737225b8c9239e7b7e2a SHA-1: 24628b3530a5fb0494e8da7d013fb0b36e643164 SHA-256: 16feea0df9bfed9f1b803936b45ec30828a7b7fc54f80bae8cbdad8d3a45cd55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=how+to+setup+directv+satellite+dish PDF link annotation
    • http://clientbluebadge.com/zimamij0uw35.pdfIn PDF document text
    • https://veralekixa.weebly.com/uploads/1/3/1/0/131069874/df8d21be.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/iaF1hgr/programming_languages_for_games_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/j3BEie4/zubuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_6026081d1c59c.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/kisakilik_zolajilagudusi_faziloravolad_ximirag.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/zajogazasududof-zifokefuzur-lozagesafa.pdfIn PDF document text
    • http://runolive.com/1096978870spbo6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_60472351b0350.pdfIn PDF document text
    • http://seplafond.xyz/nepaduvovf4uzz.pdfIn PDF document text
    • http://classkaod.ru/37629141460l9f1h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/how_to_fix_microphone_on_motorola.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/allah_ke_bande_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0a8d00-c7a3-49cb-a47c-19761ad04fc3/fluke_435_operation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/music_an_appreciation_9th_edition_access_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05bfc3a-868d-4d0b-b968-8f0e23d2def8/93353059078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 5052 bytes
SHA-256: d1dfa954eefc97a8d499e26e3367d9707ff120ecb6d901452bcc6ce1eb70dacd
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10652 bytes
SHA-256: 54de3add68842d952e10b45bc734536cf9700fda479c98841d082ec6a3b90c13
font_02_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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