Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a741568ec4e9a6d…

MALICIOUS

PDF

64.3 KB Created: 2020-11-13 17:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4319f831666b238f7f91cacc6aa318a SHA-1: 7ab976220e5fc1be4850c1d4482729e7701488f3 SHA-256: 7a741568ec4e9a6dd00c0195fa6e084f4e9fafc3b12bc3d3d9893e75a241be4f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('trafffi.ru') that is likely part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://trafffi.ru/strik?utm_term=dubin+ekg+reference+sheets
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/9956574.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fa44ac6983db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/garorowa/fudelavakixizu.pdf
    • https://uploads.strikinglycdn.com/files/1bdc0482-b4c8-40a7-9815-789213ff1b4f/ty_dolla_sign_campaign_torrent.pdf
    • https://s3.amazonaws.com/saxefi/albumina_y_prealbumina.pdf
    • https://s3.amazonaws.com/nujosuwemedadi/hp_deskjet_1056_manual_printer.pdf
    • https://s3.amazonaws.com/vapelurowar/autobiographies_of_famous_personalities.pdf
    • https://s3.amazonaws.com/sazixipame/enter_hulu_com_activate_code.pdf
    • https://s3.amazonaws.com/pazifetanegapu/trait_de_versailles_1918.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/befunky_mobile_app.pdf
    • https://uploads.strikinglycdn.com/files/e534166f-3eb4-4ffa-a144-7396201d7839/effective_practices_in_early_childho.pdf
    • https://uploads.strikinglycdn.com/files/b3f344c0-a0f7-4864-b415-4668183c3582/vibekanitowewefuxuwe.pdf
    • https://uploads.strikinglycdn.com/files/9c332ce7-cd24-4bb4-937b-016c0b5f7826/95195886539.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b532.bin
335f93f7a629c232f630965e6afecf357d96a295ae5fa04fafa7da3a5319328d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB532 4876 bytes
font_01_sfnt_off0000c5c7.bin
12ee1a1e648d5f5030fe885a69eb0fcacd39afffa8f7b5599250e4072c76109c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C7 9712 bytes
font_02_sfnt_off0000e672.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 4324 bytes