Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d6e3bc7a02ae9…

MALICIOUS

PDF

80.8 KB Created: 2021-03-09 16:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 529d2c9086d48b991845c367fdfb3f20 SHA-1: e1b279e81206cd1ea326ee9f06bb80362411fab1 SHA-256: ff2d6e3bc7a02ae948094e80d28d38d974b235d6451c883a53cb0162af491978
126 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 heuristics indicating it functions as a link farm directing users to external URLs. The PDF contains numerous embedded URLs, with at least one, 'https://zajinet.ru/award?keyword=jean+anouilh+antigone+pdf+english', being a primary indicator of malicious intent. No scripts were extracted, but the PDF structure and URL distribution suggest a phishing or malware distribution attempt.

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://zajinet.ru/award?keyword=jean+anouilh+antigone+pdf+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502920/normal_5fd09c753291d.pdfIn PDF document text
    • http://lowwsaw.xyz/sitetalokexuhlzau.pdfIn PDF document text
    • http://winoraama.space/13674869717oj7cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fe55ef54defc.pdfIn PDF document text
    • http://fimewot.xyz/best_self_tanner_2020_walmartppxes.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/what_is_the_best_cordless_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/hgeWjaH/pititem.pdfIn PDF document text
    • http://worldworkbook.com/zakibif8est.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/fjaKPgj/kozesuxawepidovojunaz.pdfIn PDF document text
    • http://scarcebook.com/verbos_en_ingles_y_espaol_regulareswg55s.pdfIn PDF document text
    • http://fastcreditcheck.info/dejefaxagopepinemene8qvrz.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/how_to_unplug_sunbeam_heated_blanket.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/how_to_install_samsung_mini_split.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/totaxuvalidigapezofiji.pdfIn PDF document text
    • http://lighterusb24.site/what_is_the_main_theme_of_a_dolls_housee484n.pdfIn PDF document text
    • http://eferevole.com/93685699721fozfq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxepivol.myartsonline.com/cuantos_mililitros_son_300_gramos_de_azucar.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/dhekelia_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/very_sad_katun_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/haemolytic_anemia.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_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 5196 bytes
SHA-256: 787dc1a3d888265a8a8dc0d61c28dd21b654b41a6a864e66ef42f34451bc0f4e
font_01_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 10400 bytes
SHA-256: 5634461afc27f726fbead1c087d6106c361773d4f0e8463df3b89c533f09fe28

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