Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9afcd63bdb3367e…

MALICIOUS

PDF

69.6 KB Created: 2021-02-09 13:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa0be654638c8adc2927e9631801b971 SHA-1: ee1fbc5281d07b0b0a7b76debfda0f6dcf776086 SHA-256: b9afcd63bdb3367ec6769ad1de0900f1d907435cea8fa6dcc2d0eff15f911c2f
184 Risk Score

Malware Insights

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

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 0.9668

Heuristics 5

  • 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
  • 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://seumenha.ru/aws?utm_term=auto+chess+guide+mobile PDF link annotation
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/xitakobitise-xojamijis.pdfIn PDF document text
    • http://italiabeach.space/vemodifusunonugezakomup0u95a.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/molexonokarose-vimelawisafegav.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/hdiict2/general_online_store.pdfIn PDF document text
    • http://auto-fishing-rods1.club/hacking_wireless_networks_for_dummies_espaolxniwv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492286/normal_5ff7c9ec77f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fdb0c6b68e1d.pdfIn PDF document text
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/mowufod_bujabu_xotabitej_wajesatevegitu.pdfIn PDF document text
    • https://tenivutod.weebly.com/uploads/1/3/1/0/131070705/c23ada5ddce.pdfIn PDF document text
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/luguravuxomudolegita.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/9b6fb71052b1d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fd68234443ad.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/dijuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_6000f28d9076d.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/pogolo/besharam_movie_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/mugasusiregedi.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5176 bytes
SHA-256: 1d2d8ec213a0bbad2d1b6c834180309aca26d07e532288810a969bc4d1d3e7c8