Malicious PDF — malware analysis report

Static analysis result for SHA-256 680b3a04ede035fe…

MALICIOUS

PDF

97.8 KB Created: 2020-12-28 14:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 99ed3fe64ad4ccdba16f74c465cc0efb SHA-1: 51724ef599061190fb0a99c2619945b8f6de167f SHA-256: 680b3a04ede035fedbf96ff4d13b5fa64c1dd1b41db83685c8b1e8551f93807c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with one prominent URL pointing to a potential phishing or malware distribution site. ClamAV and ML classifiers also identified the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=darkness+rises+best+class+for+pvp PDF link annotation
    • https://cdn.sqhk.co/numanazolov/hgDhenu/onedrive_for_business_sync_client_latest_version.pdfIn PDF document text
    • https://zuzigiwasozobe.weebly.com/uploads/1/3/4/6/134676944/1273596e1.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/4hevnhj/wawiwoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_5f8f333b40e5d.pdfIn PDF document text
    • https://cdn.sqhk.co/tumozaraf/hegitii/champion_eleven_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/JzSia7z/94357431861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/cameroonian_dishes_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/69021502480.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/41100556829.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/freeman_kennedy_school_website.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14448 5272 bytes
SHA-256: d09c8de18be71e60e8aa48c32f1c85de3567326c5740208981ca1988e7e28cf2
font_01_sfnt_off00015656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15656 10580 bytes
SHA-256: 69523bab743d0e337ef8bf3ddf03ba1b1c9fefd2f4e0c56ab0a005680e868b4d