Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc5875f10348bc0…

MALICIOUS

PDF

71.9 KB Created: 2021-02-27 21:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5d6df262a2c1727319e1278448d6718e SHA-1: e9c3fb772f031d19bd02551b330bc64a91b9df8b SHA-256: 9bc5875f10348bc009946510916541c8dbbc8ecb37ed97d4ed668ccc4903ee8f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is part of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=free+download+video+asmaul+husna+anak PDF link annotation
    • http://moscowflowers.online/wuloponumesovopates3gzbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_6016432eee253.pdfIn PDF document text
    • http://menbp.online/76996719867yw777.pdfIn PDF document text
    • http://maddot.space/certificate_of_employment_canada_formatytb3d.pdfIn PDF document text
    • http://reduslim-europa.site/radiofly_filme_de_comedieek1lh.pdfIn PDF document text
    • http://vir-tus.com/business_studies_grade_12_study_guiden7zkf.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/2005_nissan_frontier_transmission_fluid_check.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/98257108236.pdfIn PDF document text
    • http://shmelev.pro/73697118522c9o2y.pdfIn PDF document text
    • http://vezerfa.xyz/1547255213vgdr6.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/is_paternity_leave_a_legal_requirement.pdfIn PDF document text
    • http://4escam-bot.online/zifibipegfdopv.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/perodonasedej.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/nelson_stud_welding_n4s_manual.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/how_do_you_repair_a_septic_drain_field.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupuwijekoja.rf.gd/mazajaruxajitabilifemapex.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/how_do_i_reset_my_canon_mx492_ink_cartridge.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 5236 bytes
SHA-256: 4d0ec1be75cbf9ffe314e60568d995ed7499a2e6986b3daf15908aa7dae8ac52
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 10052 bytes
SHA-256: 4ad04d31d6c5b357d995dc3876cad1beb43d427b510c136970dcbfaada4b44dc

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