Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7049e73266e7cf…

MALICIOUS

PDF

62.3 KB Created: 2020-11-19 03:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d8050cf5e9b37e51fa882eb54bc41f SHA-1: d3ad97b42214f4c5a57b33a4287888c243a7e270 SHA-256: 3f7049e73266e7cfd89353cfa7e390f936dabaff774f568e3c5cfa683035ccc1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'traffset.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-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://traffset.ru/123?utm_term=what+is+a+heater+core+in+a+truck
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f89db28036c7.pdf
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f8f8ddd5bc3b.pdf
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/molukekesi_dipujajoguba_paxeni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05543bf5-232b-4f97-a69b-bbdca75d56ad/pisesabe.pdf
    • https://s3.amazonaws.com/sazixipame/otaru_japan_cruise_ship_port.pdf
    • https://s3.amazonaws.com/gonuxiwela/robatuxuporexenixi.pdf
    • https://uploads.strikinglycdn.com/files/8b1714dc-69fc-431e-a672-f95c95e3dd6d/5635446789.pdf
    • https://uploads.strikinglycdn.com/files/c5b33403-e715-438e-a7a2-eb6542b6eed1/99586506771.pdf
    • https://uploads.strikinglycdn.com/files/071865c4-69fd-481c-9ae2-0bdf60f93ccf/xorebuduwotadopezudesig.pdf
    • https://uploads.strikinglycdn.com/files/89e80cc2-d214-40a3-a02f-27795c6d8b11/bus_bus_routes.pdf
    • https://s3.amazonaws.com/zufojadibi/academic_integrity_quiz_answers_quizlet.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_off0000ba4e.bin
ec55c2a530b33cfedbf3beac38391d803b3bb5007808f80940e74fb1507a10c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4E 4932 bytes
font_01_sfnt_off0000cb1c.bin
72d87a96f092f0636b6cf3d4446b221160bd67dafb1093fb8c0f685991e9680f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 9728 bytes