Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd33118f18f48d6…

MALICIOUS

PDF

83.6 KB Created: 2020-12-18 13:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7a5bbc500cc060dd410f5eafdec2dd97 SHA-1: 2a827a373401f2e7a8519e4ba5d7a0e5a4c2736a SHA-256: 8cd33118f18f48d6c4e36b7059a33b0f6bac0c9c33632be999efbddb3dc40d15
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded URLs and the ML classifier's high confidence score suggest malicious intent. The document body, though heavily obfuscated, appears to mimic search result snippets, aiming to trick users into clicking the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • 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://trafffe.ru/strik?utm_term=best+buy+asus+laptop+charger PDF link annotation
    • https://lodofimedama.weebly.com/uploads/1/3/4/3/134327961/gerinutubikose-dopakenaxil-fideladuwaludo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fdbdf72485b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_5fc3428f8e1a3.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/d61b7d23af.pdfIn PDF document text
    • https://lowisaxov.weebly.com/uploads/1/3/4/3/134361609/wagomevosi_begafanog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd14c55dd8cf232ed127c0/1606227143196/black_pearl_wow_3.3_5_wotlk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5169dbe9b69395125da21/t/5fc969ba634f6910fb439a61/1607035323143/valkyrie_profile_lenneth_ios_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48c3eaf37e3b6491cf79/1606371523915/nail_polish_pen_gel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6763d68612547ed8438d4/t/5fd159929a9e5443ac6b4581/1607555475204/best_goal_goal_prediction_app.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_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 5488 bytes
SHA-256: b42e0f62e00cce300e9baf88edda9e4d1191e9c61b5a4e8e27116f25f551767c
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 11780 bytes
SHA-256: 47ed14e676394bfa21a952ca09646a3435a1d077d02eb5466b4af261aec51a23

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