Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59869f66d2ee142…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 00:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bdf00306c599a262693ee24c01fd545a SHA-1: ccdcf41619c2f1419463fecd1f7e3c3c7b6cd966 SHA-256: d59869f66d2ee142fda0014be9e8f0c039a965ccdf52daa47aae9c4c994d8396
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'https://jacksth.ru/award?keyword=desercion+escolar+en+secundaria+mexico+pdf'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=desercion+escolar+en+secundaria+mexico+pdf PDF link annotation
    • http://nurokojo.mypressonline.com/yaesu_ft-450d_qst_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vetejevibas/ghItjgJ/budop.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/ieQjgjd/fun_race_3d_game_download.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/78331944991.pdfIn PDF document text
    • https://cdn.sqhk.co/mimotulifoti/5Ati8Kl/vokojilapumivur.pdfIn PDF document text
    • http://vladmer.ru/wopibitimaledg.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/california_vehicle_bill_of_sale.pdfIn PDF document text
    • http://visionnew.xyz/xojebo3by1w.pdfIn PDF document text
    • http://domavera.ru/numawinc4k.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/jfifie7/lg_xboom_speaker_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/the_passionate_shepherd_to_his_love_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6522cc5-1f1d-4623-823e-b525e0f830bf/what_are_the_importance_of_using_electrical_safety_devices_at_home.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/31320794885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92b28be-28a9-40fd-9f29-db3d0553843b/skyworth_55-inch_uhd_android_tv_55suc9300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211c16bb-8d8f-4ef3-a6bb-026c50390255/62666166271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a284eee1-b20a-48a5-8dae-39b1f66c08e3/26917267420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bf471e-70ad-4e7c-b51b-df7337b68ee0/kuxozanigize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77fa883d-71ed-4c3d-9062-63ea22224f9b/78699087887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44e9715-d743-46d2-8392-58806199dc37/76374974700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f3ddc5-c108-4ab6-b4ea-bad1a8d7e355/database_management_system_mcq_questions_with_answers_download.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_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 5368 bytes
SHA-256: 6c6f05707a8b376c2aaaff895cd2249663f3c8c34aafe282a8a7467666fa04c9
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 11836 bytes
SHA-256: 5626f55ef28d2149d946de27170ae795a04304f986bbe47581688460ac710599

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