Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1e6d5dcd84270…

MALICIOUS

PDF

91.3 KB Created: 2021-09-22 14:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1bae123e47c925a1a67ff57be504d34 SHA-1: 1044ea230cca469eed09de8315f0c91584c774ca SHA-256: c7a1e6d5dcd8427045fb3cbee0b6ed453a6ced5f4b2bd8cfb5516c203b7dd545
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful content.

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://pixomot.ru/uplcv?utm_term=doctor+zhivago+pdf+download PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g8nu1tsmtmf29e2hk7h8v6qld4/62442789698.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/pekaluzanipenik.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/rebiravutegevirofone.pdfIn PDF document text
    • https://highrise.pl/file/giduvuwumajuwak.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sutetekasimika.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/gesamo.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/65909896791.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/poxovaxoki.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/83310024748.pdfIn PDF document text
    • https://linardi.ru/files/file/pusupazapurexuxupos.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149481938d5f---43478103.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/42532859980.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/33635487477.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/23477727193.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614141dbbc3c7---velulafuravijalezafedufo.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/sijiboduzonuj.pdfIn PDF document text
    • http://homeopathyhk.com/files/wigerelobolajinexamafos.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/16222004832.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/94671932391.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/46260905251.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/vajuzukewubusuripuw.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_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10812 bytes
SHA-256: e0b7db21e412c3639e27f41a6baf47cfcc73c38a386d874e4d1c53dce32ce287
font_02_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 18780 bytes
SHA-256: 7b0af0aab8840164439d9040b3e167b360fc5047dc1cf631e87be34e10275abf

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