Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4104602b286e5ca…

MALICIOUS

PDF

68.2 KB Created: 2020-11-30 10:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca4a714b1c05a94f766f67ca49bfe8a SHA-1: 744201888c421340e830b626e304c826e69c7285 SHA-256: a4104602b286e5cae8963444b31b499583c5ed7a2a09de47f906f5025bfe14cf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or unknown domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM firing indicate the document's primary purpose is to redirect users to external sites, likely for further exploitation or credential harvesting.

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-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://trafftec.ru/strik?utm_term=the+marketing+plan+handbook+fourth+edition+pdf
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/d1ffc3b.pdf
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/jinewizug_jotimi.pdf
    • https://cdn-cms.f-static.net/uploads/4387417/normal_5f8dc6f17f5ae.pdf
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/xofekogoberula.pdf
    • https://bufazojilenove.weebly.com/uploads/1/3/4/6/134639622/samogoxaxomu-kufakixij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazifozixawus/53065956673.pdf
    • https://uploads.strikinglycdn.com/files/b7f84541-da5c-494f-8310-0135dd2e9057/bevofiri.pdf
    • https://static1.squarespace.com/static/5fc10ac260f2895dc1e8a19d/t/5fc2e89164571256549c9d60/1606609041997/motezagutavogejumisebaxaz.pdf
    • https://uploads.strikinglycdn.com/files/fc414487-9444-4f84-98d0-206ef6d0ccfc/36649847063.pdf
    • https://uploads.strikinglycdn.com/files/90e7bdaf-7a9a-4560-aecd-ced7000339f7/78624272556.pdf
    • https://uploads.strikinglycdn.com/files/54d513d0-ec42-4296-bf08-8c71d9cc7e83/godadepopaxazusinapidij.pdf
    • https://s3.amazonaws.com/zidenigad/characteristics_of_light.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4b789b1ed03538d13fb4/1606372217574/1477048291.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_off0000ce3e.bin
f909c5af5d471fd6371685c1c38331842618593a5eccc50225f4eee730798d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 5428 bytes
font_01_sfnt_off0000e080.bin
8b7a5aa327fe49a8cdfe05bffd59d449dbe2ac66248ec7a3343980a35b9017b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10384 bytes