Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6c9e27c905d2c5…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 14:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dffdb463c353ff36ca89429d6d54f17d SHA-1: ba5fa91acbe5b87357702fc5efec0c8bf643c247 SHA-256: df6c9e27c905d2c5391313f2d7000819f414b80916869749eb055ae45a1816c8
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document exhibits characteristics of a social engineering attack, specifically a browser extension installation lure and a ClickFix pretext. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading and executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://midufefew.ru/award?keyword=codigo+de+error+netflix+m7353 PDF link annotation
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/fagefanazimaf-mazatovevoropew-jewod.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/igLihRd/melerafe.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/bcg0ibE/16340754293.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/nhcjahc/bolaloketizovadudodilizuj.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/gh0QRge/castle_storm_ps4_trophy_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_603c6ce33f64b.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/vinerivur.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/UoIjjsL/2870423636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_600e0293b365d.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/dighijg/wafabogazuzuzonubupegoboj.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/zevadejufemawew.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/iajfwhj/gipakagadafuratul.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/xaxega-mijixibe-piniberajuzaka-nutejoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/voxeguret.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/itil_v3_foundation_course_material.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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 5180 bytes
SHA-256: a41fe262840a76e68c069acda3a0031fe51496744b5e74d9882e3a01a185a78a
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10184 bytes
SHA-256: af00f02247983c1d398e06e940b87fbc0c5ddab9bcfa583733fcd3698a54aacd

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