Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fb12904a0033ce…

MALICIOUS

PDF

84.4 KB Created: 2021-04-13 00:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c17521296b2c72b546e15b2e3673ca04 SHA-1: 93146d093b8160b2e26be435ab85110fb08bf234 SHA-256: 11fb12904a0033ce92ec264d9f7581e1b47773abea5d0190d0116c0571e5b19c
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 0.9997

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://bologen.ru/strik?utm_term=netflix+movie+american+assassin+cast PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460043/normal_60093dea81b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fea36b57bb50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fe1205b315ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_6035e8ab8913a.pdfIn PDF document text
    • http://dofoxamus.22web.org/5334174525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_604511ff56d21.pdfIn PDF document text
    • http://maleev.online/scott_pilgrim_vs_the_world_video_game_charactersa86vh.pdfIn PDF document text
    • http://onatural.space/can_you_stop_family_court_proceedings1vt0d.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/12_step_meeting_attendance_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_606c90c4cab18.pdfIn PDF document text
    • http://organic-ita.space/bundle_android_adalahqht5c.pdfIn PDF document text
    • http://lifeeuro.info/ripasadebugozeb2jw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ffaf2b090c25.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/welding_and_fabrication_workshop_tools.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejedizanabi.epizy.com/arduino_free_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc9ce02-8c38-4901-85f1-d327eb5105ea/romuzilesixig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75441a49-561c-4aea-8e73-fa99dff57cfd/52425599890.pdfIn PDF document text
    • http://kabumosubeno.epizy.com/80873091324.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/amar_chitra_katha_download_free.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/bilirrubina_directa_alta.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_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 5124 bytes
SHA-256: cf7bdf949a65abf36c2797f60416561fb0df252fd7d3ccd610fb17b429a11558
font_01_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 11268 bytes
SHA-256: e51f123f10e03635f8fb112d0f3bb46a2c979dcb23dbe90f757aef8811ce42bc

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