Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1c21d0f1b421ec…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 18:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 717173d2b56769fceec3b954bf6dab53 SHA-1: 985a600168d11d9bb243aaaadaac2b49bc16f195 SHA-256: 0f1c21d0f1b421ec603bf2f717c57dbc3a01ad86139348a99c45f87e92d7d291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crewmak.ru/uplcv?utm_term=global+competitive+strategy+spulber+pdf PDF link annotation
    • http://studiotecnicostradi.eu/userfiles/files/ninedenatimuwujupefagu.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/33884700862.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/14520011154.pdfIn PDF document text
    • http://levotst.com/uploads/files/44996478279.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/url6a2vgh7fs94m0c8d1tkrkor/19060909075.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kofozefitubulevegidobisa.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gexapusulivefasib.pdfIn PDF document text
    • http://yuha.be/_files/file/vedeberosikori.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/68649662918.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/figapebakawif.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/javojexo.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/muwijinogopajepe.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/3294127386.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/karaxuz.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/13923683086.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/84448239751.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210907161300.pdfIn PDF document text
    • https://bselink.com/userfiles/file/69508851621.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d35b855---81814016073.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/loxelavejotepurapufovog.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/lafapenunowutatoguzumat.pdfIn PDF document text
    • https://tmtteks.com/files/4144390049.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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 17492 bytes
SHA-256: 15aeec2776b0511fe212272734338bed330bbf3e8e011c562ed3503022f048c4
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 11316 bytes
SHA-256: 17c3817d8aebeb6b7ea3a9556af35034a5b3d04f7713d093dc78aa693a8c00a4
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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