Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d9e7d929d1a1cd…

MALICIOUS

PDF

78.6 KB Created: 2021-04-02 19:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 995d920faabcd74d4831ffd53643e6a1 SHA-1: e1ba132fa65b13e6be3379f8575626ff0cea25af SHA-256: 65d9e7d929d1a1cd243228cf95db2611f05160121e58e00d387aefd03cbbf1dc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on potentially compromised or disposable hosting to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=how+to+connect+disney+circle
    • http://rumurel.mywebcommunity.org/marketing_management_15th_edition_ebook_rental.pdf
    • https://cdn-cms.f-static.net/uploads/4374374/normal_600fee78b5712.pdf
    • http://vugekowuzujed.scienceontheweb.net/pizaxojekonulavemixinumof.pdf
    • http://leporabev.mywebcommunity.org/panasonic_bread_maker_sd_zb2502_recipes.pdf
    • http://pubofumoxo.scienceontheweb.net/boy_scout_second_class_rank_requirements.pdf
    • http://premial.su/kedodazoladunenipewew0olps.pdf
    • http://parkingtest.xyz/motiwutalabiwelisotaxibum31xfq.pdf
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6021cd6775abd.pdf
    • http://diporesorojina.scienceontheweb.net/percy_jackson_series_disney_plus_release_date.pdf
    • http://tujubafi.getenjoyment.net/apostila_para_aula_de_violo_em.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5fd1fb26ebd85.pdf
    • http://sibuvre.com/epidemiology_beyond_the_basics_third_editionsmnda.pdf
    • http://trokot-shtorki.online/xefunabujiwakoqyqk6.pdf
    • http://sakivometo.medianewsonline.com/volar_sobre_el_pantano_audiolibro_descargar.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://dowotezovemalo.mygamesonline.org/78562386941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mogedozara/8874572445.pdf
    • http://pozijawikubinun.myartsonline.com/97055286573.pdf
    • https://s3.amazonaws.com/dogazisuze/line_plot_answer_key.pdf
    • http://pizenusogusu.atwebpages.com/pdf_beveiligen_engels.pdf
    • https://s3.amazonaws.com/vigevot/zedefasusozopuvexusew.pdf
    • https://s3.amazonaws.com/gosete/sabupipeteseluzolubuvax.pdf
    • http://bejanifezilo.atwebpages.com/89447015000.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_off0000f727.bin
5e3103d6412f888c4da493f0874a9b344a97252f4d38d705c56717a859fa98e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 4876 bytes
font_01_sfnt_off000107e2.bin
48d77861fec56734b90dd6836119fc06d9ab55c7b74ecec76048a84150606dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10940 bytes

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