Malicious PDF — malware analysis report

Static analysis result for SHA-256 10331873405c1141…

MALICIOUS

PDF

71.6 KB Created: 2021-06-10 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 179b75df78cebab906bf1d85893a3f20 SHA-1: e20cd2539d88cb9645832e66fc694cc47e5b5295 SHA-256: 10331873405c1141b05ea6b571500e5a8518236fcbe82ebead68ff9889023d3e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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://oniceh.ru/pbw?utm_term=convert+video+to+audio+file+online+free PDF link annotation
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/d2dda90d36ed.pdfIn PDF document text
    • https://kidofepakanuzok.weebly.com/uploads/1/3/4/0/134096393/vawinatosatag.pdfIn PDF document text
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/7304390.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/5100109.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/rijatuxido.pdfIn PDF document text
    • https://dupujemewo.weebly.com/uploads/1/3/4/0/134040979/cea2d3d9a.pdfIn PDF document text
    • https://puvojokuxika.weebly.com/uploads/1/3/5/9/135985507/9266252.pdfIn PDF document text
    • https://narezivif.weebly.com/uploads/1/3/5/3/135307162/kerimuleza_dexoxofe_debogasigu_bavugixod.pdfIn PDF document text
    • https://bisimopax.weebly.com/uploads/1/3/0/8/130814127/416c98b.pdfIn PDF document text
    • https://basapozixuw.weebly.com/uploads/1/3/4/7/134701575/2582313.pdfIn PDF document text
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/98fde9.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/soxosowe-zosavexavivew-bowakem.pdfIn PDF document text
    • https://pifabesi.weebly.com/uploads/1/3/5/9/135958575/roturumesusiw.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/6bc47695-d911-419f-8dbf-eb70bae68334/popupogawajotabaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d5294d-f420-43f7-8352-5892ca952e88/12278249784.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144489765/msi_n1996_audio_drivers_xp.pdfIn PDF document text
    • http://mogulobobis.pbworks.com/f/37317277889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd7ca1f-3028-4ff6-924d-45338fc0e2f6/zigavusapoginowetoxum.pdfIn PDF document text
    • http://supulilofib.pbworks.com/f/exerccios_estados_fsicos_da_matria_6_ano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9776333c-aabd-4ef8-9e67-08a6f39974ba/34930974629.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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 4688 bytes
SHA-256: b7ddda67906ba1cfb344af8a92fbc62307453762bfb78c9b0b70cab470df128c
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10548 bytes
SHA-256: 9ad28b9ebefdf513e446722da2b12417d5bfaa414bd2d16610be787ba1042df7