Malicious PDF — malware analysis report

Static analysis result for SHA-256 f005c4961dcb574f…

MALICIOUS

PDF

94.8 KB Created: 2021-06-11 19:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0062f97355a773a74778935d1ad52f83 SHA-1: 85d10228c365eea1d7eec81009b7d72941167a11 SHA-256: f005c4961dcb574f705eaad31b8928071eb1bf035dccaae5999e7829c09e43cb
186 Risk Score

Malware Insights

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

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 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://queure.ru/pbw?utm_term=fifty+shades+freed+2018+full+movie+download PDF link annotation
    • https://nufatobi.weebly.com/uploads/1/3/4/3/134382182/wuselavot_nututag_dakaxilap_funugilajogiroj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5ffbaf24e896c.pdfIn PDF document text
    • https://pudafeborebe.weebly.com/uploads/1/3/4/3/134335494/3415417.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/8666840.pdfIn PDF document text
    • https://giwemonuxir.weebly.com/uploads/1/3/0/7/130775654/jawipetovogizufopo.pdfIn PDF document text
    • https://bapejezobo.weebly.com/uploads/1/3/7/5/137513383/763935.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/kiridavagu-naniwafexad.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/jetezamewezilu-zapiwas-begatireb-mizileset.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/1619526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_600ffc554cc77.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/3d1cbfc19e94460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5ffdc442cb26a.pdfIn PDF document text
    • https://doxazijizule.weebly.com/uploads/1/3/4/6/134640144/waduvefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f3e59d-2752-4cb5-a313-3e64c49a1106/delta_monitor_shower_cartridge_31125.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/grade_4_math_division_worksheets.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/f/que_es_sistema_endocrino_para_nios.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/papos.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144651558/vomiwewimete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a91f3d-09cd-43ed-acc3-c9fef9c93114/bandlab_cakewalk_tutorial_deutsch.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/8659529761.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144528675/9777446972.pdfIn PDF document text
    • http://vamafob.pbworks.com/f/mixasatirapusozedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fdbe56-c977-432a-85d9-207a0430aa50/bomajaf.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416160/73574146546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7345b3cd-72ea-41ff-ac7a-cb0f9eb7a617/77001650094.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_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 5876 bytes
SHA-256: 74cc59fb11c924455fc538552f3d1d96497d54af35a65b28f59c082e936ab3f7
font_01_sfnt_off000145ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 11736 bytes
SHA-256: 9df4ece64bc13757be8bf2392f140b4041c4125cda547e80b5e06630cdfff0f1