Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9ba02c335243cc…

MALICIOUS

PDF

67.8 KB Created: 2020-12-04 14:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be54767759821cee80cb4525bba7c8cd SHA-1: 789a76382ce72071e1376c2f6fbac86a97ce0e2e SHA-256: 5c9ba02c335243ccd3534a549e98ffb06854a555d9582eebea2c09af1520ac60
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'trafffe.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=guitar+neck+jig+template
    • https://cdn-cms.f-static.net/uploads/4500199/normal_5faec8c7f22aa.pdf
    • https://xitesinunupur.weebly.com/uploads/1/3/4/3/134318791/kilukevokuf.pdf
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fb31d38e8b47.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f872b29e5270.pdf
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5fb275ebce2db.pdf
    • https://mafopobivo.weebly.com/uploads/1/3/4/3/134322173/fanesopix-xisogoju-jomezuvesowu-wajubetarido.pdf
    • https://jisevudes.weebly.com/uploads/1/3/4/8/134882916/donutabunosi.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/farokidebokomaka.pdf
    • https://vixodago.weebly.com/uploads/1/3/4/7/134716619/5298383.pdf
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fc9dbb21f3bc.pdf
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/xogan_xufifabexamej_nemokujofi_fomapu.pdf
    • https://getugegifajit.weebly.com/uploads/1/3/4/4/134481189/vubonuwuxagolal_rejububasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dalava/lus_vaz_de_cames_os_lusadas.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b54c.bin
5740c474bde2f9329fafa3aa33b27f72563e1b4adfdab51a7b74b6b4ee4a91be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB54C 5244 bytes
font_01_sfnt_off0000c71b.bin
60d81c65b70e827ee4b34648ffd4a73f8a2d4ad3a068692a0a0ba798d8ba523c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 10676 bytes
font_02_sfnt_off0000eb4b.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16312 bytes

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