Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce86c8633a74369…

MALICIOUS

PDF

72.3 KB Created: 2021-03-03 14:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e342d8117d8d65f3b6719a308eb39f6 SHA-1: 628e7b99f603cd5576028cc78779ac4b3d1cf299 SHA-256: 8ce86c8633a743693a707baa7d973a0ae79d5275ae245cc3640308aeb12bf248
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic flagging it as a link farm on disposable hosting. One of the primary external URIs, https://baarspo.ru/strik?utm_term=get+user+id+wordpress, is a strong indicator of malicious intent, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support the malicious classification.

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://baarspo.ru/strik?utm_term=get+user+id+wordpress PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447258/normal_600627e97b8e6.pdfIn PDF document text
    • http://samyog.ru/bimujeririkuxuworiwarkwba.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/jiEHjim/dune_buggy_track_near_me.pdfIn PDF document text
    • http://zumigiguba.22web.org/honeywell_analytics_301c_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_603dd1be09ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe0b860e26a0.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/ngeEgiX/bubifesunawofarajevex.pdfIn PDF document text
    • http://hookup756.fun/murumutukaderaladutinuwnrtna.pdfIn PDF document text
    • http://storezone.info/tefutunejidukadowanh4bqc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5ff097f0459b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_6018d7fe8fade.pdfIn PDF document text
    • http://niwujobexev.22web.org/89845693561.pdfIn PDF document text
    • http://mobile-media.moscow/minecraft_capes_1._13._2itq3r.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/hxMjj2o/underhand_serve_volleyball_drills.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_600c24c00d1b6.pdfIn PDF document text
    • http://thelait.pro/aliexpress_tracking_information_is_temporarily_unavailable7dep8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonizud.epizy.com/98629214417.pdfIn PDF document text
    • http://mukazofe.rf.gd/34769393892.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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 4832 bytes
SHA-256: 26cc25a140e98db26ff369586814b4c1fd8465b191fb3f1ee3237ecf192a3f5b
font_01_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 11912 bytes
SHA-256: 695faa5b56ea0fe0bba6848862a6242f76c44a4ae209b9c08427c3cff2862ad3

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