Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc264f5aa95d3cb…

MALICIOUS

PDF

90.4 KB Created: 2021-02-13 12:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f9285d328eeb1ff9a70f599fb6b986d SHA-1: d1e2b4be0ea650542d7961a91d3c931ae40412f2 SHA-256: ddc264f5aa95d3cb1a3dbf2d48c2316245fe889acc276562af5b47890aba9334
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains or link farms, indicating a likely SEO manipulation or phishing scheme. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users to external resources, potentially for credential harvesting or malware distribution.

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 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://leonvi.ru/123?utm_term=virus+crochet+shawl+written+pattern PDF link annotation
    • https://cdn.sqhk.co/namulofilox/ihZHhcw/new_rock_ringtone_zedge_bollywood.pdfIn PDF document text
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/sizekize.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/1b17d8da339021.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/igfjdhb/68381662257.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/hQhasG5/hack_game_jurassic_dino_water_world_apk.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/nugefibutem_falonafukefat.pdfIn PDF document text
    • http://tortomsk.ru/breast_cancer_now_financial_reportr3nuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/X32jg3s/jiomeet_pro_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_602646f38819e.pdfIn PDF document text
    • https://vaxulisexo.weebly.com/uploads/1/3/4/6/134600260/suwasowir.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/e23438c.pdfIn PDF document text
    • https://tebugusenaj.weebly.com/uploads/1/3/4/8/134870623/4633292.pdfIn PDF document text
    • http://mon-compte-cmb.best/760724183312680h.pdfIn PDF document text
    • http://mexicotop3.xyz/109309134979zv0x.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/judubiwuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 5080 bytes
SHA-256: 4e1b97e1169f552438af9f7b5797f503a13c169b9e6c486bddbc726195e62ccd
font_01_sfnt_off00013745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13745 10800 bytes
SHA-256: 58ff28d0b3a246172bc4a7103dd1ac30ad4137cf1f9b7a0e395f41198255b017

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