Malicious PDF — malware analysis report

Static analysis result for SHA-256 df570ae4ecd2a686…

MALICIOUS

PDF

77.2 KB Created: 2021-04-22 13:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a44eaacda6ebf1a85d6a3e3f3f3be814 SHA-1: ce512236a291582a9baa81d98bd18460f0effdde SHA-256: df570ae4ecd2a686f66aa915484e95b16cc613a70561270f5a2933c1d160cd0c
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 a heuristic firing indicates it's a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though truncated and obfuscated, contains a lure related to 'Sword Art Online' and references wkhtmltopdf, indicating it's likely a crafted PDF designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=sword+art+online+best+order+to+watch PDF link annotation
    • http://xoziduso.mypressonline.com/contract_of_sale_of_goods_business_law.pdfIn PDF document text
    • http://yoptan.space/sujavetewilifikedemzwdz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_603fa4340a3bb.pdfIn PDF document text
    • http://ourfanz.com/duwazadipebuvinaruzafu1wo1.pdfIn PDF document text
    • http://poradoit2.site/inputs_definition_biologyvb8b4.pdfIn PDF document text
    • http://desawigoxikugaw.mywebcommunity.org/difference_between_casting_and_forging.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_601d52ba23137.pdfIn PDF document text
    • http://wirelessinfo.ru/original_american_cookery_book860tt.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/bjhhMha/xubifufejevorovado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fe50aee43b7e.pdfIn PDF document text
    • http://fullpisetc.ru/ventajas_y_desventajas_de_inventario4ualr.pdfIn PDF document text
    • https://cdn.sqhk.co/jefadata/gge8gpr/bricks_breaker_quest_519.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/jeMWLja/letter_of_recommendation_template_ms_word.pdfIn PDF document text
    • https://cdn.sqhk.co/samumosoxivi/blzibji/ufc_expert_predictions_tonight.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/f6b7442e-85d5-4565-a57c-0772c0293711/78267185252.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/54115552109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3e9ef5-f2af-44af-8070-20c0d0bccf0d/rawobejanomopeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285c5843-57d5-42fd-8611-a2fd2644c28f/descargar_curso_de_guitarra_acustica_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/83007300858.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/sifeduzobumexob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7890e0-ed3d-432b-bfe9-410ac74213f8/how_to_configure_nanostation_loco_m2_as_repeater.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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5360 bytes
SHA-256: cba5daca5478364920656b4e4c9267e888081acd05185ec7b4203f179de26a2d
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 10848 bytes
SHA-256: 13ef68cfb0e7f75034a7dcc5a38ce3ad122cf96f9e747a789d2d405a82da5f5e

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