Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4887a58865de36…

MALICIOUS

PDF

77.4 KB Created: 2021-03-26 12:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8de1077c51d7ff2451039272e5001643 SHA-1: 63a2c2853e598c4c621c5cfce7ce5c3421b3d438 SHA-256: 1f4887a58865de36fffdaa907246271814906d65607039804e202b1375675cba
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/123?utm_term=cercle+de+la+forme+lecourbe PDF link annotation
    • https://cdn.sqhk.co/mekaxuzoxu/chajhTO/future_perfect_tense_worksheet_for_grade_5.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/zudopun.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/91314823077.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/eMjcbCp/sync_mobile_apps.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/48794587082.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/99786995907.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jyADmih/extreme_landings_pro_apk_3._7._2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5feb4ed659e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6029c777438a6.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/ic7zibo/primer_of_public_relations_research.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/4heA1yQ/vaxitalitugon.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/hepjdjD/g_switch_2_game_download_for_pc.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/national_rice_cooker_manual_sr_mm10ns.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/556fe8ae-b9d2-4fba-9634-598652a1178d/18845680909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb71d5b-2143-4be6-b55b-b4d79fc5ca53/how_to_watch_star_wars_in_chronological_order_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9fddd53-9e77-4c73-b826-2e3a1ca7e45c/venn_diagram_tool_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95c69b8-f2ae-432f-a48e-3dc0575315d2/apple_financial_ratio_analysis_2020.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/graphic_design_brief_template.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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 5032 bytes
SHA-256: 4b1b68f31494ca7da011b6b394492f4ed4ce8c7d4a8194321da55941434c6a5f
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 13476 bytes
SHA-256: 8f5edada6878ce847af4b37311177ccad2c1cd449cda0127965c3aaf11b556dd

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