Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f951c4d55a919d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 09:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3981e25be9662ddad2791eaf53c340dc SHA-1: 5f4297b2afd5c2342bb0d3d65b1dc5b6d17ee3f7 SHA-256: c0f951c4d55a919d6752c15bb0b43e60af58fc4fc72d05f8e6cf6c098b3fdff3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to various domains, with a high concentration of them being disposable or unknown. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://assessmentinsight.com/ckfinder/userfiles/files/3468715642.pdf
    • http://risorsaterra.it/userfiles/files/wonuvuwelopavovuk.pdf
    • https://sanghvicranes.com/staging/media/poguxe.pdf
    • https://ccaquebec.com/userupload/files/todifinem.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/5039138501.pdf
    • http://dfanchem.com/upload/files/madutuwegir.pdf
    • https://tbsva.org/Upload/files/20210910195115.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pejupufegu.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/nurifodosutamodaru.pdf
    • http://dolphinegypt.net/userfiles/file/gogosanekome.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/86418506981.pdf
    • http://orderkai.com/uploads/files/70134531603.pdf
    • https://mclandpin.com/calisma2/files/uploads/ninotugijute.pdf
    • http://suaups.net/userfiles/file/84257567165.pdf
    • https://ontech.vn/images/ckeditor/files/mavowowugonarenekux.pdf
    • http://antonio-pelella.eu/userfiles/files/jupofadukowijer.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/tatunemaxe.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/4093296229.pdf
    • http://cachnhietcacham.vn/Images_upload/files/8019516442.pdf
    • http://www.frank-diagn.hu/userfiles/files/tazumirukuwanenabanolam.pdf
    • http://stin-verdon.fr/assets/Image/files/55033409737.pdf
    • http://dietetyka-24.pl/images/files/xizibavuxejixe.pdf
    • https://lacgl.org/upload/editor/file/vifezibaf.pdf
    • https://4wheelchile.cl/admin/uploads/file/xexatatubukexavowe.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/90479925637.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=importancia+de+la+comunicacion+oral+y+escrita+pdf
    • 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_off0000d0c8.bin
11d5f1591603b2b8b24f95cee42c10886126be123c02f516815302921931264f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 17132 bytes
font_01_sfnt_off0000fbf7.bin
fde323f7e2381a619e286d7996faca9377f2934af9c1308673d8a3538dd89ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10944 bytes
font_02_sfnt_off00011556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.