Malicious PDF — malware analysis report

Static analysis result for SHA-256 506bfbb323fba985…

MALICIOUS

PDF

63.1 KB Created: 2020-11-12 21:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fd272343dc25f66197e84d8c0635789c SHA-1: 1d1d863df626f83f45e06e48b65aa4132449b367 SHA-256: 506bfbb323fba9859cff8346236102511e50b2dab461d2d4f374d4ba0632aacd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and potential malware distribution lure. The document's content and heuristics suggest it directs users to install a browser extension or update, a common tactic for credential harvesting or further payload delivery. The presence of numerous external URLs, including those on disposable hosting, indicates a link farm designed to redirect users to malicious sites.

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
  • 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://traffset.ru/aws?utm_term=devexpress+report+mvc+demo PDF link annotation
    • https://pudibodug.weebly.com/uploads/1/3/4/4/134464821/kijedufofun-bufuxofom-suvezox-mikoteraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f886e1ca7517.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/zapokatukexogax.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/9633391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5f8d6f4308065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f88d106ac399.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/f401bd84142fad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8fb5930c705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fa9172c4ca50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fa3b37f212fb.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/vagifemi.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/sabibogutuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5f9726964528b.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/6c8a263a-1f3d-4673-ae7a-cca5bd6eecf0/download_zuma_deluxe_full_version_fo.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_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 5104 bytes
SHA-256: bdf56b09cd74376fe0b22169e4bada9410daf5a91abb914798e04addd4e4c163
font_01_sfnt_off0000c73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73A 12488 bytes
SHA-256: f0a32460bbe1e2cc3341465ad4a8448770293104495059e3bc6fab47722f6c0b

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