Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caa641c1404a67e…

MALICIOUS

PDF

72.5 KB Created: 2020-12-16 18:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 52352c3bd27ae97e5b9b912eae755e3d SHA-1: 1c3395adf5e24c191efdd77ce90a314d447868bb SHA-256: 6caa641c1404a67e9015608ba74032912ab350b3bd9513e19220d0f92bf4dbb6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'traffset.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external links, suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=fringe+poster+competition+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498992/normal_5fd1e90b323f2.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/1171588.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lafomu-fowesutom-dabikituduxun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5fc7ffafcb516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5fc449d9e57bf.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/fukepez/oregon_coast_trail_hiking_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf56989b1ed03538d212b9/1606375066622/55223932432.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ebbeff13940aa24cd01f/t/5fc3d6769ee0f32b87c921b8/1606669942196/polaroid_one_step_express_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e93ce5c7695ca99badce/t/5fca77e38e8fba586e5f7416/1607104484672/90920934846.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/whatsapp_video_gujarati.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf3801a633b27d3ae764fe/t/5fd165131693665fc7c4c82a/1607558420254/topeak_pocket_rocket_bike_pump.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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 5240 bytes
SHA-256: 08aab8a3ba44f0a746dd3163589f8b3957c90304e23e5f8853f04b06739f4150
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 10184 bytes
SHA-256: db7812010dce508a809e60bb729227234d4975ce5d3a87bb280388bf93665ad8

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