Malicious PDF — malware analysis report

Static analysis result for SHA-256 b096b3af3b6ca067…

MALICIOUS

PDF

98.1 KB Created: 2021-05-07 11:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 158f66dd0dca9992bef227c1b9038673 SHA-1: c538a1b4166048cc7ab3a407220019233702c077 SHA-256: b096b3af3b6ca0671ca9326837c7a9691750179c6c9c0236358b7767986ba678
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=how+old+is+hardin+in+after+we+collided PDF link annotation
    • https://cdn.sqhk.co/wugotiparo/MmhiDgj/46370128027.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/bDvlgfU/76597935094.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/sgeKXKj/40057588822.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/loxobom.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/aididBF/bomber_friends_game_free_download.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/19453380323.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/j9mbih6/dragons_titan_uprising.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/gdaiege/battery_charger_for_cart.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/fireredokanebopi.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/jeaifjg/fimotimukopatadege.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/ey8ighh/network_marketing_products_supplier.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/kexisutamexetojupuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383928/normal_5ffa244469860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_6052ee45d161c.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/christmas_carol_lyrics_book.pdfIn PDF document text
    • http://timinome.getenjoyment.net/how_to_add_memory_to_lenovo_t430.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/argala_stotram.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/ahdihjg/89441883999.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc415f9-f6e8-4e5d-9022-231fa0bb28c6/bunker_hill_safes_customer_service_phone_number.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/domufi.pdfIn PDF document text
    • http://solarujarinobo.myartsonline.com/63582551708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a9842b-7e1e-4136-b5f3-cd1cfb1027fb/dragons_of_autumn_twilight_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3418476a-4c66-4458-afb8-10bf2a14d565/lezurediwuredaw.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_off00013efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFA 5160 bytes
SHA-256: 624ae2c075c51b898fc336e65e196da26efa847ef02437cd4f5b7f4566147d5f
font_01_sfnt_off00015091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15091 12668 bytes
SHA-256: 3bd1f500c550189f8ea00465a1f7d68d5a6bd4f98c7983beef552e7c00096b76