Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a51da5e0caf9bef…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 03:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 369f6311eec4485eecb60f1af2b959b2 SHA-1: ddd161f2074f98d98650aab33c63d32cb547a592 SHA-256: 2a51da5e0caf9befa5348d5db8e5a8a9026ca4d53ea640995157d073a57c63f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links pointing to external domains, many of which appear to be disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=kashinath+ghanekar+movie+online PDF link annotation
    • http://ebbers-schilderwerken.nl/uploads/files/4793500659.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/35140744413.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161497b5b73bab---rasazetujidal.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/42189064777.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/16922515847.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/sajijurowabijat.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/89605094033.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/69455935164.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/46799277569.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kogat.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210915_D4C28B548A44B7D7.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/1784005603.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tulagukewukosevapo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7ade939e8ea811f1ad64908ebb055fd/lomupesutokepizuvigedelow.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109180803482919.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/86492687089.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/8644841507.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/forajasoxesale.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/97837131695.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/54183403927.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/xopekidupowot.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/loromokof.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/fitivekogilinip.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/baxiluwifeguwux.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/bifozebuzovuweluvak.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/nagakibuxubalukapeg.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xidavivuwarivijanejidifar.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 10704 bytes
SHA-256: 0ab95db0b514c26238b60fff6f14f3cbc6994c40a875d11f10b1155d44928ef7
font_02_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 17940 bytes
SHA-256: 13f7c6fade67c608f9a5c3974a935d33cf0c722d2c496cabb2833df1502ee943