Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b94afefef367ffe…

MALICIOUS

PDF

67.9 KB Created: 2020-12-23 09:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3c6e6a2ad9b4a238769c03126a77341c SHA-1: 713f33244da9b2c4c1f2583ee2331bbca15fb28d SHA-256: 3b94afefef367ffe05575b5366a3b71692519014ea6a06dec39289baabcf2c26
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous external URLs, with one specifically pointing to 'traffset.ru/aws', suggesting an attempt to redirect the user to a malicious site. The PDF's structure and the presence of multiple disposable hosting links further support its role as a link farm for malicious redirects.

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 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://traffset.ru/aws?utm_term=serenade+schubert+piano+sheet+pdf PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8714721a925.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/4047225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f8b8fe8c094e.pdfIn PDF document text
    • https://bogimejo.weebly.com/uploads/1/3/4/7/134713861/90e91c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422367/normal_5fe21bfeea534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5fca8ebdda5bf.pdfIn PDF document text
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/jutajoletegevil-nijoxura-zexus-rinufegim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379046/normal_5fc7bc125991b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_5fbee241e7b19.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/folema-loxotafezanu-buzikofojafufis-baxozedidoludo.pdfIn PDF document text
    • https://fikepeti.weebly.com/uploads/1/3/4/4/134489659/kekoxugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b04a865-4abc-4f3b-93e0-863aa8b5aabc/xetowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a634578a-0e3c-434b-99f5-35609ea202dc/libros_de_narcos_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f919889-2506-4a84-ad2e-29e024afa762/26646259845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ab4711-9e7c-4c38-b8c3-df76e112393e/95465320609.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_off0000c0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 5452 bytes
SHA-256: dc7e86e2e187067e0ce73a2261ccb67330241c6af370f2384eb5d5d1b99fe731
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 15208 bytes
SHA-256: f545aacfe7bf292d0cf4e2ac086f959fc61fad7fdbc0e60940cd00ab59b80426

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