Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefe8d423521ff51…

MALICIOUS

PDF

105.4 KB Created: 2021-03-14 05:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4123a6ed44fb7d53e4c0169575b73e6a SHA-1: 89ddf404b2590ffdc51ff166f7818b218a96f3ad SHA-256: cefe8d423521ff5199149232bf9e74ccb81f607e4d69595d82b2dd481f236d81
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' firings. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to domains commonly used for phishing and malware distribution, likely serving as a lure for users to click through and potentially download further payloads or submit credentials.

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://kuzutuzo.ru/award?keyword=bls+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/fukonovum/Cibiahc/gekezije.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/gezopemovorobe.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/fjcidij/eagles_greatest_hits_album_download.pdfIn PDF document text
    • http://comforfemj.fun/92457263151ujtb.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/how_to_cook_potatoes_in_my_power_pressure_cooker_xl.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/idDjbgh/fold-_up_wall_desk_budget_buddy.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/dwjbVif/63799790914.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/hieTjga/exploration_worldcraft_miner_online.pdfIn PDF document text
    • http://blockhcain.host/10222104328gubv8.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/94341041675.pdfIn PDF document text
    • http://avtovishki-msk.ru/survival_city_zombie_defence22478.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/gcUfb1r/vokawuxomodepapawixuji.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/wekibik/how_to_draw_a_rose_with_a_pen_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/fanakosabefigetivi.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/89537402117.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/komalogadaped.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/example_of_application_letter_semi_block_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/vapevevugagosalig.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/gavazavazaguta.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/zarivagefojuxuselabi.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/best_quotes_from_percy_jackson_books.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_off00016084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 5052 bytes
SHA-256: 17a910b3a7622987f72a95afaed4b775b0a700c4d6f459a0ecef7c1db8d2c529
font_01_sfnt_off000171d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D8 11436 bytes
SHA-256: 1dd2dc47ad450ddbee16615f73451b7156a5f249bbfb4ff27d242be283428405

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