Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecf4b560a3879ea…

MALICIOUS

PDF

59.5 KB Created: 2020-11-24 05:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3add7b1bce346b94906fa01651049103 SHA-1: 5d8d787b76f554f49c3f72f3af75d7e39ffd6e45 SHA-256: 9ecf4b560a3879ea7dd7c78e2afdd5fbd309d7c4145fa901f61e0ece475cb0b5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm with numerous external PDF links, including one pointing to 'traffking.ru', suggesting a lure to download further malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://traffking.ru/strik?utm_term=good+leaders+ask+great+questions+free+download
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/8573486.pdf
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fb3e4b22829f.pdf
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5f9b2739f2f0d.pdf
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5f92fb7ca138b.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/dozusepap.pdf
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/3439589.pdf
    • https://figerifefiter.weebly.com/uploads/1/3/4/3/134343277/35e6fbbca27.pdf
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/ziguraxanumatolakidi.pdf
    • https://bojamaluzide.weebly.com/uploads/1/3/4/2/134265872/465245.pdf
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/f6f0ae60401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a51f5b8-ed9f-4853-8e1d-8ac66941741d/wirifowo.pdf
    • https://uploads.strikinglycdn.com/files/22d93740-4178-4867-9667-4994ce9a3322/25593642021.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac7f.bin
3967c767cd86cbebeec845fa0c75e7cb73f3e823ffd88f00f81380913d306903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7F 5388 bytes
font_01_sfnt_off0000beea.bin
6c317c20aff0a64156df73e4a17a05a7930179af6ad8f0ae665b70a6d3336ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEA 9576 bytes

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