Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e68d5187b663f92…

MALICIOUS

PDF

79.0 KB Created: 2020-12-01 05:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45762b861a4701025bc87927fda2a8db SHA-1: d1f8479dbbede9886a42e7ee5226c71408386186 SHA-256: 9e68d5187b663f92f5274a9c61f0714ef1139f9c49fee3a53579bc494bda8319
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the nature of the embedded links points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=asahi+pentax+k1000+price
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5fc3d3bd95e0b.pdf
    • https://sebijulevezokoj.weebly.com/uploads/1/3/4/5/134512917/6944629.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f870ab86507c.pdf
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f8d3cd10f942.pdf
    • https://livekurot.weebly.com/uploads/1/3/4/4/134443702/090e992.pdf
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/eb845c406c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/toguvaju/cercle_de_la_forme_dauphine.pdf
    • https://uploads.strikinglycdn.com/files/c447a32e-e6c9-44ed-a1dd-ebeb3f458635/jacob_kounin_theory_of_classroom_management.pdf
    • https://s3.amazonaws.com/mejifavo/mechanics_of_materials_solution_manual.pdf
    • https://uploads.strikinglycdn.com/files/efb4dc1d-1484-4fe3-a39d-4c2fcc3f701d/20482775037.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/apush_chapter_8_creating_a_republican_culture_quizlet.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53a25147b148042a02ff/1606374307240/centos_7.1_minimal_iso_download.pdf
    • https://s3.amazonaws.com/fekazudabo/argentat_france_tourist_information.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f609.bin
036d7ec14a23fe0e78cbcb878a8d993f1145975cc42e08535a6918edae42f29f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 5304 bytes
font_01_sfnt_off00010816.bin
88698484e8dbee66f74ba3a5fa8e3bc06b7ab5430212623002c9ff53e5366366
pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 11520 bytes