Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4f514eb96a378a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 18:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80c2bdad01993c42518161e73a073ce3 SHA-1: 7a3e62ffa11692a2d72e46254c4b1aff4208f4fb SHA-256: ce4f514eb96a378a73e7d41ddbb180e88b1409237dea25a9007155aac2c3e089
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest it functions as a link farm, likely to distribute phishing content or further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.allatpatikapecs.hu/images/file/ralivitexevugivixi.pdf
    • https://pasarangroup1.com/contents/files/femibixigud.pdf
    • https://ptogel2.com/contents/files/vaperopi.pdf
    • https://skatrip.com/basefile/skatripcom/files/16641161597.pdf
    • https://hssanesteban.cl/files/91184402568.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/72555749216.pdf
    • http://w-mill.jp/images/file/62114219899.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161360b2d17f93---31507445266.pdf
    • http://rcp-ranstadt.us/files/zeforovubokiliturunowar.pdf
    • http://maiodi.com/userfiles/files/vadikozuwenotakos.pdf
    • http://everestlodgelukla.com/userfiles/file/gitumunanarefakerasebiwe.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed8205489c736ee53a7de166371bdd34/56734833033.pdf
    • http://kemnhapkhau.com/upload/files/18475730291.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/77920965420.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/sipoz.pdf
    • https://carparts-fixture.com/file/file/33596927001.pdf
    • http://xingyeknitting.com/userfiles/files/domojalidizofaporuvetel.pdf
    • http://iswii.net/ckfinder/userfiles/files/40848795877.pdf
    • http://thuephotocopytaihanoi.com/upload/files/89867883665.pdf
    • http://yeongwonenc.com/userfiles/file/12131573928.pdf
    • http://www.cafeinca.com/img/public/contenido/file/24619770538.pdf
    • http://itena.si/uporabnik/file/biwojanetaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+soulsilver+extreme+randomizer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf8a.bin
06ca5626bd16ee7014b3e385bbacb9d989ea255048b4a389b733a691ab8f856b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 18508 bytes
font_01_sfnt_off0000efec.bin
cc44be66e83f59caa3d4ef77cc418f301b28ce904b1b051a09a780230a9a953c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 10828 bytes
font_02_sfnt_off00010900.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes

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