Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9dfbd6b26734c2…

MALICIOUS

PDF

72.2 KB Created: 2021-02-20 11:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 989e3bd9761133bb4c80ec1417ebdb83 SHA-1: ccdc83ce8f483c7a7b7b90f266c8f4472184e5ba SHA-256: 2c9dfbd6b26734c2ab82333e8effc3323529a566531426abf4f9cab6cfb97b47
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and uses an invoice/payment lure. The embedded URL `https://jacksth.ru/123?utm_term=how+to+use+vinegar+to+clean+your+keurig` suggests a phishing or malware delivery attempt disguised as helpful content. No scripts were extracted, but the PDF structure and external links are indicative of a malicious document.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=how+to+use+vinegar+to+clean+your+keurig PDF link annotation
    • https://cdn.sqhk.co/xeloxilava/buflsOW/60180163331.pdfIn PDF document text
    • https://cdn.sqhk.co/bogonelemid/exkQi2P/knights_templar_masonic_ritual.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/0e3865a883f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/eZIBBNO/comedy_central_schedule_today_west.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_6021722bc7d99.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/jh7jhiP/kujenolugavuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/bqageic/pizzaiolo_outdoor_pizza_oven_by_edil_planet.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/Ti0XGgi/bitip.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/rutivituj-pumagebisejil-sipusawedet.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/f6d6b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fdc33b09a9a6.pdfIn PDF document text
    • http://xukiwuze.22web.org/ziled.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/eNhc1ii/43563207751.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/lebunuzujikobu-ropabuzad-gojenomerovozer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc81443ad0ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisitibonadal.rf.gd/autonomous_underwater_vehicle_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/15167884795.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/mifal.pdfIn PDF document text
    • http://miwexekitoza.rf.gd/lady_boss_telugu_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/chidinma_fallen_in_love_music.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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5248 bytes
SHA-256: e21bcb59c1eedc201c230ce8a77f0ddb1fd897ec26840ae13b54600450f31f49
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10464 bytes
SHA-256: ea7947a175919a555ef2be1bfcdf78e63e184763db4e86abf91af4dc5f917d7d

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