Malicious PDF — malware analysis report

Static analysis result for SHA-256 052ebdb62182c847…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 16:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ed6e187e11b80b03df5c13cf29298dd SHA-1: f5f99597ab047cf774b768e7d3fb08234f152b54 SHA-256: 052ebdb62182c847b7e08ff970312653b325a9b11388946d04c09ea41a9480c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=the+benefits+of+5g PDF link annotation
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xuxubebeniridilefikura.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/wibuzuvevewepin.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/nidiwokerowolewurit.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/16908951697.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/pofidap.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/35920385258.pdfIn PDF document text
    • http://robedecreateur.com/img/files/42880236443.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sogaruzefujagi.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/19483066917.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/nisosotilogejimo.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/44079292302.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/85661430983.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pukef.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/10396743495.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/37162455087.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/nojeterugibujigeku.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jorifenagebol.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/kanom.pdfIn PDF document text
    • http://hzqzg.com/d/files/47273403646.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/sedaredu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/fidafujesiwegiguwavofad.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e607bc62---32061027728.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/31259448379.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/tetetugarudumitowewu.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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 16444 bytes
SHA-256: def0263195e57b6c369e657b9d09aea7463386f94feaa7140e37b3302f29f189
font_01_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 10424 bytes
SHA-256: 71808e729328a8f58436a5c5e19c8a0050f72e6dc5430af5c930e493cf9c50a6
font_02_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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