Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0780c655784537…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 04:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c8f397c66483ca7b54054fba4fd22bc SHA-1: 13ab4ec001cd5969130efc04e39d9a68594c5b90 SHA-256: 5f0780c655784537b461f005f4234588667793712585d9d55098742f33fb1932
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=shadow+fight+hack+android+1 PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/59717361068.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/mogasuvufa.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/pidok.pdfIn PDF document text
    • http://4rrecycle.com/files/file/40281948653.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xawata.pdfIn PDF document text
    • http://lgassociates.in/uploads/94978555980.pdfIn PDF document text
    • http://srldirect.com/ckfinder/userfiles/files/sagunujumixerowunovikozux.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/76951165526.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/29168741007.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mabulenamuvomob.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/65324990518.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_120315.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/5872156729.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/53608579896.pdfIn PDF document text
    • https://12shio3.com/contents/files/lowajedonoberaz.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/57621315464.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/89618880622.pdfIn PDF document text
    • http://rayanchem.com/d/files/vigizutotimaraxasofo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/laperobedokam.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613207df04b7c---sofawifuwenokefi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4250d2976be20a7fde4b194b25250f3/79456453053.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/rabavakiloxosovanol.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/nodiwonituxolap.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/6138402679.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 10712 bytes
SHA-256: 3ccce09df7ef4bdb928e72bea4d9a9dd2c7d26949162769594fc52436520df52
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 17704 bytes
SHA-256: fe40444bf827dab8133907a372a51d6d79ff7e4e48d863ebd316c5e6d8777de9
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1