Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04d9d483229b0ca…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 10:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 627d0f0ceef52f124c8e4394a46525ae SHA-1: bf3743d8b3917df4196d3445a2f350e46d987d02 SHA-256: a04d9d483229b0ca8c838ecf2f1792bf07ae84c377415783e35e37f371d2eeb6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious purpose.

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://jacksth.ru/wix?keyword=new+school+study+hall+games
    • https://cdn-cms.f-static.net/uploads/4403556/normal_605706b6d6a3d.pdf
    • https://cdn.sqhk.co/tisezalave/fOxE616/kitejenupolebezebevew.pdf
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fe3fc486c3a4.pdf
    • https://cdn-cms.f-static.net/uploads/4469617/normal_6028e3b9412b3.pdf
    • http://iciapp.xyz/wizard_and_warriors_3_nes_rom3xl59.pdf
    • http://kuxapiwi.22web.org/35585812735.pdf
    • http://kellys.space/2755774136960h8u.pdf
    • https://cdn.sqhk.co/bogabixexuja/fIggaws/fovojukagapenamejage.pdf
    • http://openchambre.xyz/surokimugalz8fz2.pdf
    • http://birjand.design/886750598922rk0t.pdf
    • https://cdn.sqhk.co/lobinazema/hVFqBKf/migazeluxuropug.pdf
    • http://ecoservice-vlad.ru/85204724632maboq.pdf
    • https://cdn.sqhk.co/bitajububida/idjjhdN/free_lagu_melayu_lama.pdf
    • http://vclean-sale.shop/93075312637on37c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dd10aba1-7d5f-40aa-ae41-6d8614f66f89/29221337683.pdf
    • http://sifebina.epizy.com/35376778056.pdf
    • https://uploads.strikinglycdn.com/files/651fd45a-a450-456a-aab2-0ff88bdaa664/21422945972.pdf
    • https://uploads.strikinglycdn.com/files/fa3c5af0-570e-4844-b7c1-62b79a7c3279/rubariza.pdf
    • http://wamovesomawegun.rf.gd/zuwinibipewevusa.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_off0000fbe6.bin
dda8e319c09e31a26d72b944e21ba760e05e2be5e99b47fc98b6d83756e20a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 5420 bytes
font_01_sfnt_off00010e51.bin
0514b5b1fe8dd568d952bae659d3e74da1afca11f3993b29f1454e2ba1bab847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 11392 bytes

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