Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e82b4481ccbf0b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 22:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b213465be507d65e96f1fcbceafbd04d SHA-1: 556e7b9e8c3c4fc10f47acf7d8c3a5ea8566cc34 SHA-256: c7e82b4481ccbf0bad20b9303e0307b07156bed364d116f71f30eb73e77b19fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=best+site+to+watch+indian+movies+online PDF link annotation
    • https://zlato-eu.cz/upload/files/17038690247.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/bategixijakivomigera.pdfIn PDF document text
    • http://air-ned.com/uploads/files/timematuzuxek.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/22565697896.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210905010022.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/74347426216.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/vefeto.pdfIn PDF document text
    • http://it-hair.com/userfiles/bajuvofokogumuxir.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-06/images/files/66809557629.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/45620303226.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jitofukedetobopebanulu.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/surijix.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906204404.pdfIn PDF document text
    • http://stevis.cz/files/file/14463814784.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/66595604894.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/kevadujefosoxoluvo.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/notigezojimurofevabif.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulobij.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/19284693011.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/safuniteluvarunibukek.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/11026877305.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/mokozejetoxebodono.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27d0e8963---jojakumuburasoxa.pdfIn PDF document text
    • http://lovesenergy.com/file/26175123481.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mevubu.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_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 17936 bytes
SHA-256: e8cc00e035eb9b6ff92d5839989cc227ee733c93aaefbbab7ee7eca3b24aa94c
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10740 bytes
SHA-256: 4c322dea65647ad31733000068f2856dfef139b78769c46bce1edab713545270
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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