Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7eaab158bd0f1f…

MALICIOUS

PDF

71.5 KB Created: 2021-02-27 22:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: bc68c106de6d0c2e67f48276b7f2dedf SHA-1: 56d12947d0554d8f8b7ebe632f975219667eb7f5 SHA-256: 8c7eaab158bd0f1f05916c6b266a151ea5d5719a97fd69c6cf08f23e3a7da3ef
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=how+much+time+to+write+a+letter+of+recommendation PDF link annotation
    • https://cdn.sqhk.co/moxibusas/WEdl7hg/plug_king_s_raid_vn.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/dd0992c3b5e.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/dGjckge/zosupigiwuboz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5fe52c6660064.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/kibipedoti.pdfIn PDF document text
    • https://vizufawamowimo.weebly.com/uploads/1/3/4/7/134700475/9501389.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/167352.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/iigcbji/vijejofomabe.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/9bc2f4ab0b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_5fd99abe4e8c4.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/3329715ae74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/daydreaming_reading_ielts_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/lopod.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_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5136 bytes
SHA-256: 3aab6882dff4d73912039db71a9a50a10756b2dec6cfeb6b906df01acd0ee45e
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 9876 bytes
SHA-256: 296d074f6b75cd5a84091f5ed732a73ed01b3bac00368309be0773dfc1217f34