Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbf08ab1e49fa38…

MALICIOUS

PDF

67.7 KB Created: 2021-02-11 13:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c69434b405644199532735f42665bce0 SHA-1: a20c8fcfe18894db6ae75b70d7044bb6e93227e3 SHA-256: 1bbf08ab1e49fa38a039923338273b29e0082857d7730ee064a9d6d7a7371baa
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF's structure as a link farm strongly support its use as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/wb?keyword=barista%20cv%20pdf PDF link annotation
    • https://cdn.sqhk.co/dukosisevu/aUP0C7R/melojaduwuxozipotaz.pdfIn PDF document text
    • http://koreanluxe.com/una_vida_robadaix35x.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/iUqgcbt/zolumukilivedamo.pdfIn PDF document text
    • http://mir23.xyz/bluetooth_windows_xp_32_bitk0a67.pdfIn PDF document text
    • http://qunit.space/janusiwifadulewutpxhf3.pdfIn PDF document text
    • http://baxagaxisatipa.22web.org/asme_b31._3_latest_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jahhagg/british_superbike_rider_salary_2019.pdfIn PDF document text
    • http://tlgfree.xyz/38085226749cgohg.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/e0lgf07/1366138669.pdfIn PDF document text
    • http://kozlo.space/free_commission_fee_agreement_template9a9j3.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/47102924584wrafr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevegure.rf.gd/88851055706.pdfIn PDF document text
    • http://reratosagozi.rf.gd/3d_book_cover_template_photoshop.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_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 5228 bytes
SHA-256: 887b5427484cefdef1bc4f7495ec273c8fa1ce31ec6e83d15789f31c0e2ffc24
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 11256 bytes
SHA-256: c4b52ad5a3a19a58219782c94a94897ee18d90caa4c72d98fb1e03b5a48c746e

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