Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f5e6c046c1eca8…

MALICIOUS

PDF

60.2 KB Created: 2021-01-29 08:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d4ed15299d94c317823693899ac33e59 SHA-1: 1687486d72d6d73bf8b2d7f657474d99a8e60c8b SHA-256: 84f5e6c046c1eca841df63952b24254de881dc7b5a39e44675497f37a5a9e42d
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=endothermic+and+exothermic+reactions+worksheet+tes PDF link annotation
    • http://com-servers.online/304401296322hfxj.pdfIn PDF document text
    • http://youralteragoods.com/63751219289w2ka6.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/U2RNghQ/sample_marketing_plan_for_food_truck_business.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/aGH5hb4/tosexobiwa.pdfIn PDF document text
    • http://redtea.space/xamiditowa5xmg.pdfIn PDF document text
    • http://italysummer.space/41118833503sedqi.pdfIn PDF document text
    • http://cz-nitrof.website/fozidibumakuzonobapifaxo5r1m.pdfIn PDF document text
    • http://adanakebap.org/lerelowisenuraguwizuji5hik8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixatax/attaullah_khan_all_song.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/bach_bwv_1004_chaconne_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/cruise_reviews_berlitz_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/72168921209.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/46453184602.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/30864229585.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_off0000b07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07D 5328 bytes
SHA-256: 0cd0885f67029d238d2f4f403b0c6a7f5ce714e0b7238c7069b2ee7b1ee3ef64
font_01_sfnt_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 9784 bytes
SHA-256: b00debecbe1bdc3fdef4bda5d124ef650b60c75e906c05dfc1e08b0a19dca447

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