Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac37fe9f0864911…

MALICIOUS

PDF

71.2 KB Created: 2020-12-26 09:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc1a3895ac46cdec374c1042958db38 SHA-1: eafb42ac5d0f8134a9eeb5f07804bf63a620d306 SHA-256: 0ac37fe9f0864911f49ddbceea569ff6e0be9308251b852e44defab6825d4c8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

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=wall+mounting+stereo
    • https://rudozusaviso.weebly.com/uploads/1/3/4/0/134041113/3575650.pdf
    • https://cdn.sqhk.co/masamiwe/gjOiGid/52519697216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovezodepugov/57575010212.pdf
    • https://uploads.strikinglycdn.com/files/7a9596b3-0657-4190-a9ee-d40f5ab0d9bf/90570601711.pdf
    • https://s3.amazonaws.com/luxaduzimase/59075326164.pdf
    • https://s3.amazonaws.com/dukajevo/11617631627.pdf
    • https://uploads.strikinglycdn.com/files/5a344eee-ac6c-4441-9324-76310a856440/clash_of_clans_air_attack_strategy_th10.pdf
    • https://s3.amazonaws.com/nitatotol/magia_de_arbatel.pdf
    • https://uploads.strikinglycdn.com/files/92dd6f36-cbf3-4856-806e-bf742486f05b/zunolurerifazubeb.pdf
    • https://s3.amazonaws.com/levumoduf/destiny_crucible_ranks_glory.pdf
    • https://uploads.strikinglycdn.com/files/b310c1a8-2f3d-451c-8a2b-d8872e1a1edd/9937210111.pdf
    • https://uploads.strikinglycdn.com/files/715719be-f11c-48e2-9728-8f8652cf1d48/64705708348.pdf
    • https://uploads.strikinglycdn.com/files/91d8a217-378f-465b-9045-c37215ea8717/gubager.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_off0000dc06.bin
dd54242cea56bb0cbf8592cc6484f761123c5ee60fca0a1bd2cc1b6872d892ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 5020 bytes
font_01_sfnt_off0000ed10.bin
972aa085e3d31ff700049d869856cc819d939e575fc95dd9a05d70150bd198dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10284 bytes