Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3823b99ff762a6…

MALICIOUS

PDF

77.9 KB Created: 2021-03-01 02:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d28ba1757a03589553a3e05ff3e62e2 SHA-1: eaba39d0d81e275b16061065f31404ef375b8ce4 SHA-256: 6a3823b99ff762a67264139c3429a88276a49886fed185c84680b4e156cbfb14
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://leonvi.ru/wb?keyword=pioneer%20deh-x3950bt%20manual%20espa%C3%B1ol', appears to be a lure for users searching for specific manual information. The presence of numerous PDF links indicates a potential effort to distribute or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wb?keyword=pioneer%20deh-x3950bt%20manual%20espa%C3%B1ol PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415519/normal_6000257845b14.pdfIn PDF document text
    • https://cdn.sqhk.co/vetipewalu/ciehdY9/rakujokaronojulemedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_603a598f372d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6024b669eb01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_602ed8478ac32.pdfIn PDF document text
    • https://vexoxedurajawo.weebly.com/uploads/1/3/4/7/134704707/3070417.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/lenumiwaxibasog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_603c22a7959a5.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/rajuwulamovajovil.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/gmxdgEa/zubedezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_6009330e22b1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fe2578ddd67b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5feb406401bcc.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/eKichgj/tujamajitevakobujumoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcddc73aa973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd97174180d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 6240 bytes
SHA-256: f13c614d9e44f528b6e3aab8f04374f2dc3afcbc5e9224fee38fbda884eb4a2a
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10936 bytes
SHA-256: bc646a1a535c07fdac2c8f825b42e79bd849f35b9f49e5b29d25cb92fdef3f5c

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