Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e34d55f1e11b225…

MALICIOUS

PDF

70.5 KB Created: 2021-01-08 12:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b23164b9b342262f9e0d816fe68a9f6 SHA-1: 7374651fcbd1be2632f4dc51a317d7f8eab3bd04 SHA-256: 9e34d55f1e11b225625929e6919532ecfbeff811dc214a37e3b5b8a6855e9196
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=four+strand+braid+tutorial
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/7787011.pdf
    • https://kemosufasegu.weebly.com/uploads/1/3/4/3/134348140/547394.pdf
    • https://ramojiri.weebly.com/uploads/1/3/4/4/134443871/9623390.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/91e26.pdf
    • https://cdn.sqhk.co/joxutedunik/ieUQMk9/46684049153.pdf
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/wisenekafebu_jemoxufexilaje.pdf
    • https://cdn.sqhk.co/mapelimujeku/hYig9je/maxubadifira.pdf
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/c56c37be3eec210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e5c7481-3412-4d27-b84e-d91f2c277727/makanefukafov.pdf
    • https://uploads.strikinglycdn.com/files/2d132cc7-4218-407e-a4f5-7a568ec90d6a/tinipesepab.pdf
    • https://uploads.strikinglycdn.com/files/81d2db5a-4838-4236-a46c-f8ba632ba081/35484987457.pdf
    • https://uploads.strikinglycdn.com/files/cb58848f-77c7-4e2a-85cf-1122414ff88f/vojobemixu.pdf
    • https://uploads.strikinglycdn.com/files/1c958be7-2154-4228-8b29-53d0cda65105/cpm_geometry_chapter_1_closure_answers.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_off0000d883.bin
a096c9f23db84ba1e3901d2a5ca1bb35dc7335a70a2f2ecb75fc31986cbd3285
pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 4916 bytes
font_01_sfnt_off0000e942.bin
0d454ec9a3d61358f84db86e215392bc0ca825f222411f42ed15d1abb54a00d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10592 bytes