Malicious PDF — malware analysis report

Static analysis result for SHA-256 38de7af629278dfa…

MALICIOUS

PDF

67.4 KB Created: 2021-02-24 19:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: db0f9b1b073efbe1b07b8f880ca23be2 SHA-1: 1f15f7ded8d4293d163d0b256acff778a5eb0dce SHA-256: 38de7af629278dfa52528cd74a43139b991097b8cd01078dc5cdb762be525a5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=nixon+black+watches+sale PDF link annotation
    • http://xitnet.fun/35366903325ezzo6.pdfIn PDF document text
    • http://graatorama.space/judith_butler_gender_performativity_bookflch7.pdfIn PDF document text
    • http://gatorama.space/ultimate_uno_r3_starter_kit_manualne6ph.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/briggs_and_stratton_500_series_158cc_carburetor_adjustment.pdfIn PDF document text
    • http://prizinsta.site/aerohive_ap130_installation_guidekb27q.pdfIn PDF document text
    • http://geesecam.com/aqa_gcse_physics_textbook_answers_hodder_education6hlf1.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/charlie_and_the_chocolate_factory_music_original.pdfIn PDF document text
    • http://center-about.com/30696597403sozv6.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/45777341645.pdfIn PDF document text
    • http://winoorama.space/lamukowefug1e7n8.pdfIn PDF document text
    • http://vipmanmarket.space/witcher_3_ps4_crafting_guideblnjc.pdfIn PDF document text
    • http://prod-fruit.space/twrp_3._1._1-_0i7rx0.pdfIn PDF document text
    • http://swiss-gear-top.xyz/how_to_improve_empathic_skillsm1gti.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepofif.onlinewebshop.net/vazuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 1584 bytes
SHA-256: 3f970c45e1aacf9fc5a3f7f8715ea8552ab866e181089cb3f9e66f48da3a7345
font_01_sfnt_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 5124 bytes
SHA-256: 5c7d967ec5b0a21d744b4062b60f9ab2f670d02c15ea920b2cf482e6ed935fec
font_02_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 9576 bytes
SHA-256: ded43967510e492e8000561a86c0ac339800897679384f060990c2eec861b01a

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