Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b49e4fc8c9b7e1b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-27 22:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a973a301fd80db164ca78db2284ef9d4 SHA-1: 927ac7f44b0e02b1c69f4bad0db740661ca24b29 SHA-256: 4b49e4fc8c9b7e1b59855c24cafeaa7d0b7ed956eb4f65180ef8bad47c8f8c5e
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains an embedded URL pointing to 'seumenha.ru', which is likely used to redirect the user to a phishing or malware distribution site. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+are+good+boat+names
    • https://cdn.sqhk.co/dofexoxev/7Dk1IXe/japanese_circular_keyboard.pdf
    • http://gakagebir.mypressonline.com/novo_biotin_bula.pdf
    • http://miwewumexurigan.sportsontheweb.net/77742398361.pdf
    • https://cdn.sqhk.co/zizenozi/kThiiiE/73452037098.pdf
    • http://devivitonewe.sportsontheweb.net/attach_files_online.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd1caaa1db49.pdf
    • http://xapidomin.mywebcommunity.org/xegasufexoxeguwov.pdf
    • https://cdn-cms.f-static.net/uploads/4453342/normal_60468f0274610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_924f746300974fc29e0ac166adf056a7.pdf?index=true
    • http://luzojora.atwebpages.com/60026990965.pdf
    • https://uploads.strikinglycdn.com/files/af4a1b08-7c90-4d14-af8f-f05e42404439/keystone_70_pint_dehumidifier_manual.pdf
    • https://uploads.strikinglycdn.com/files/2f8a4dce-12de-4631-a161-2e7ea81e2a5a/how_to_run_table_topics_toastmasters.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_9931bf0dbafb4d789cfe3ff5b9e8470c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac74a4d0-a15a-4959-bb99-48884baeb717/birenivudolovajip.pdf
    • http://taguloxutenafol.myartsonline.com/93743477678.pdf
    • https://uploads.strikinglycdn.com/files/d033e4b9-18ad-44bc-9f76-7eab6c8ff45b/83961659190.pdf
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_1a6c377dc41941fb808530449ee7d6c9.pdf?index=true
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_e83d4788470f479aa9c071961bc07c24.pdf?index=true
    • 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_off0000f28c.bin
bea849e4ce0138c5ae6ad3cc271074ffcc77f10818a23daeda54add7f1c052e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5360 bytes
font_01_sfnt_off000104a3.bin
59fc1a165b7afa599fe5159dd21e2d14c1bfa3602204d9220f8869a665c23501
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 10996 bytes