Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac60bb165329b67…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 22:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3df3f7bf0b50a543546d9da58212224 SHA-1: 36dc6b5fb9dd6208fb8ffebca56c507f5043f5ed SHA-256: aac60bb165329b6786c0938c7cd350cfbaf6f1f5dc79a1b0ed763bd7b9444a2e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, and one specific URI, 'https://seumenha.ru/strik?utm_term=binomial+expansion+using+pascal%2527s+triangle', is highlighted as a potential lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple external links suggests a phishing or credential harvesting attempt.

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://seumenha.ru/strik?utm_term=binomial+expansion+using+pascal%2527s+triangle
    • http://steh-sistem.ru/sufolevaximounm3z.pdf
    • http://future-techno.ru/barracuda_backup_server_390_datasheetlbjsb.pdf
    • http://pazifelurup.medianewsonline.com/64099173468.pdf
    • https://cdn.sqhk.co/xovujiroveg/UhajeCJ/68257477632.pdf
    • http://matroskin.space/magazine_cover_template_microsoft_publishernlj80.pdf
    • http://xawegap.mywebcommunity.org/9612322435.pdf
    • http://kesisofawa.mygamesonline.org/nuvipi.pdf
    • http://pokypka.xyz/gexizitodokisawupegup0phky.pdf
    • https://cdn.sqhk.co/sepexapubu/0hfXgjh/37495586241.pdf
    • http://siviveko.getenjoyment.net/kitchen_hygiene.pdf
    • https://cdn.sqhk.co/furigelo/ifSdSSK/valotosojifimutiwew.pdf
    • http://kimujedat.mygamesonline.org/aqueous_humor_flow.pdf
    • http://gipovasota.sportsontheweb.net/rudimajawevikilasebe.pdf
    • https://cdn.sqhk.co/boremagu/gejegdC/mercury_software_testing_tools_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasudikek/fufetonitunafalobidere.pdf
    • https://s3.amazonaws.com/tawovojo/34493019312.pdf
    • http://sovogezo.atwebpages.com/are_oreck_vacuums_any_good.pdf
    • https://s3.amazonaws.com/gewuwasi/73193860994.pdf
    • http://giworutiw.myartsonline.com/dutuziwezopijokolisavefi.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_off0000ecc8.bin
9e2486947c9f1acac41f9b4ca1fb6f7b73570a2f227178b0e69a244b7c177a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 5404 bytes
font_01_sfnt_off0000ff25.bin
112e9cb187930f688beea459a8eaa9b25460a5f1a18e1aaff8a1835c32b843d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 11808 bytes

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