Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca488561928fd2fc…

MALICIOUS

PDF

79.6 KB Created: 2021-10-12 07:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d87c28f6376a4588ec59b9e8234f6a8 SHA-1: 29f17f345e345ce072f8118a900d0dd696fd2581 SHA-256: ca488561928fd2fc22244cbb0f8adc35c118e82e37c40d15fc07cfa6213b551b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many of which appear to be part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=2d+animation+drawing PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/77626558310.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/53681427251.pdfIn PDF document text
    • https://simorgh.it/uploads/file/vajoluxuninojodaveg.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/85214801953.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/sawutonaran.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/xilijaf.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/18647523774.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/98752422334.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/26263997326.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/1506892694.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/58648642017.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/mipemaxedufem.pdfIn PDF document text
    • http://theponghop.com/upload/files/27629599022.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161609a186d585---lazutelomoxusej.pdfIn PDF document text
    • https://medpressa.ru/files/file/fokoxuredozagekope.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/wibikibajibizasoje.pdfIn PDF document text
    • https://mattress-leader.com/media/25410342675.pdfIn PDF document text
    • http://camwater.org/media/files/tokirobosakebigitozif.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/85639261551.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/1103049839.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/6628152452.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/tokuvem.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/jozud.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 10352 bytes
SHA-256: 26e49a830fe09e6b5fd9050663047737f893c0d463791265a38f5f4dd69cfe28
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 17504 bytes
SHA-256: 51d0c20768c8f51ea19bfec7d7a8f7d7f2b00f7e7d4c22ba9ae9a84890f9f9cd

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