Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b431bfafccb597…

MALICIOUS

PDF

93.9 KB Created: 2021-09-24 01:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd2b55065203253b009219e1a95f748a SHA-1: cbfc40d6c883fc3b79ac16017a04d9b0a7a37724 SHA-256: c5b431bfafccb597e3ef123a89b82442dcdc6529277173a1fa0035ed02a937c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file. The primary attack pattern involves directing users to external, potentially malicious websites.

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://cructi.ru/uplcv?utm_term=how+to+see+private+instagram+profiles+without+following+them PDF link annotation
    • https://mayphoviet.com/media/ftp/file/97935044730.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/50993974997.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/11636243236.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/19743435780.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cfcfd86ead12d3518cd1c309972b8d09/pelot.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/14051908228.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/40010070315.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gizoraxewemexaw.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/58337835136.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kiganevitujumad.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/11767110245.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/kupobalad.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/notiredujikipoborivat.pdfIn PDF document text
    • https://patc.fr/imagesfile/13001561355.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/20158736381.pdfIn PDF document text
    • https://bawauang.com/contents/files/81952591863.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/difuvinasifosoru.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4a89fc37d40659e5828dd1ebcdd292c7/78368978048.pdfIn PDF document text
    • http://praguetransfer.com/files/file/49004896143.pdfIn PDF document text
    • https://people11people.gr/uploads/File/49192064140.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/80800538013.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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 18416 bytes
SHA-256: 04c2044c9dd063a840380e0b92e72e85f9b30c05769a1b95bce94b88e2b02a6b
font_01_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15011 11048 bytes
SHA-256: 9e525c1b836476061474747ed191a8fc2902ed53a552f7563e43e1d8b098eb3a

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