Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a574c1ec53fa276…

MALICIOUS

PDF

78.1 KB Created: 2021-04-09 15:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3cb391d7293ff93fbf2367c28715027e SHA-1: 50c6d692d49e0ac6109dfb027a60aa8725d2bc3c SHA-256: 8a574c1ec53fa2767d7b48f865c100f48bced137b77bd0cf2365bcf617700c3b
146 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dafemum.ru/strik?utm_term=gcf+lcm+worksheet+pdf PDF link annotation
    • http://regse.website/carbide_create_softwarey2hoa.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/tuwifobiruzisofunisuvowu.pdfIn PDF document text
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/sejobesasaw.pdfIn PDF document text
    • http://zumasuxujole.22web.org/58978604385.pdfIn PDF document text
    • http://toportt.online/88464767018zte1m.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/hematology_book_free_download.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/time_and_work_math_download.pdfIn PDF document text
    • http://goodshopsales.xyz/frigidaire_ice_maker_parts_loweslw3a6.pdfIn PDF document text
    • http://ritefajitexu.scienceontheweb.net/female_body_parts_name_with_picture.pdfIn PDF document text
    • http://carbags.site/best_mossberg_590_tactical_stockd89w4.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/rironijufozuxal.pdfIn PDF document text
    • https://jofudetazowus.weebly.com/uploads/1/3/1/6/131606688/jezudejariwo.pdfIn PDF document text
    • http://creampiepow.club/additional_information_trong_cvldixv.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/jazofi/28769295044.pdfIn PDF document text
    • http://fofogagad.epizy.com/71440427198.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/calendario_2020_da_stampare.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/business_model_generation_canvas_espaol.pdfIn PDF document text
    • http://gibidapasajug.atwebpages.com/risk_management_techniques_in_insurance.pdfIn PDF document text
    • http://fofogagad.epizy.com/how_to_operate_sodastream_one_touch.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/dawn_of_titans_relic_fusion_guide.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/sentry_safe_key_replacement_3f2.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/komotezu.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/83209142941.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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5372 bytes
SHA-256: 04e6429eaa45f0ebff0aa65da34b6100c7ef696d29f70d84df2a21699473a368
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 11444 bytes
SHA-256: 6bae7d0a305d3cb09e81dc111b5d3c3a7d7e6cb1da27f83dbe3d97dc5e9cd451

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