Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacc4fce43e119ec…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 10:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d971f93aca558c10347a083c282ade95 SHA-1: 0acf8fe37c1faa2d6cdbd96973d8e9acc3edb9eb SHA-256: dacc4fce43e119ec840a7a00c5c3d96246821f198e55237b48427b6e933c2d7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=rog+5+geekbench PDF link annotation
    • http://www.ciesol.es/ckfinder/userfiles/files/gumaludaximorudus.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vavenore.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/gufox.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/12488317536.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/nudutozuvepuvazogunu.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/fulanoxiko.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/42557707741.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/89457975457.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/33766799650.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/29377018969.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210904_98b97.pdfIn PDF document text
    • https://hse.tw/upload/file/7968134554.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/fifugefirarirozukup.pdfIn PDF document text
    • https://suksesunited.com/contents/files/12439572062.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/pipuserekimetiveduvotova.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/87844335894.pdfIn PDF document text
    • http://pb-book.com/user_file/file/jexasabinolododi.pdfIn PDF document text
    • https://kristinanamaste.eu/files/mawidolesiriforijabituvaj.pdfIn PDF document text
    • https://blv.by/upload/editor/files/61273120617.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/rixawuzovire.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/72366c3b3f8619f2e09dad3c161d9a9e/tenewemiragixe.pdfIn PDF document text
    • https://pellevah.com/upload/files/bitekikapinotovalofude.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313389dd606---48827455885.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 18520 bytes
SHA-256: 05b1b50c5eb5474ad80a3b25c74c7394ea37e35c7d328713d638985beadd399a
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 10256 bytes
SHA-256: 8612e3fc240dffe93073413d129699985f63daa26d044481bd4227312f398656
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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