Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25dea5d113b68f5…

MALICIOUS

PDF

68.0 KB Created: 2020-11-10 05:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be4d66018bd51da659a19e2d050f6cca SHA-1: 539a7c8ae9fc96d248c41a8a22dd44ab36545c5e SHA-256: d25dea5d113b68f52bd5e2910908e47849b95228265b31467288401fef215420
214 Risk Score

Malware Insights

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

This PDF file contains a significant number of embedded links, identified as a link farm, directing users to various external PDF documents. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malicious content. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?keyword=dretchi+trinidad+and+tobago
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/d0a254741.pdf
    • https://cdn-cms.f-static.net/uploads/4460048/normal_5fa3915c12390.pdf
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f973fdf5e6fe.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/827747.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f997d9a00877.pdf
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f956d090e1f8.pdf
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5fa7ddb0025fa.pdf
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f8bf2ca4c788.pdf
    • https://cdn-cms.f-static.net/uploads/4446388/normal_5f9e2cc579663.pdf
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/bfe84.pdf
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5fa8256f11533.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8952130d7c7.pdf
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/jedimiwipukexij-sawusabosimaxiv-lagojumuruzele.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8744fd800fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/766f3092-2a1c-47e6-96d2-dcf61b6ee06a/64445449400.pdf
    • https://uploads.strikinglycdn.com/files/b41d6ab8-f7a1-408d-a24f-6020f467125f/bovubokareve.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdee.bin
3abce64cb8061a94c98dbfb61bdb17aa2517ae1f497d6724e58a05b27fdc469c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEE 4612 bytes
font_01_sfnt_off0000ce18.bin
2944cd510f472b324f4049fe24673d196ee900c9c7f4b745bb249c337988c770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 5128 bytes
font_02_sfnt_off0000df86.bin
a564501f0ea4103b62e76683d338973a2796d94a9581c808ae8be33ac0a9b3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10380 bytes

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