Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe2de0eae5a9885…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 02:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c186583577f6ae1a04b325d1b0bd8d98 SHA-1: 85b56fb9b124855976e817314036cc744754f464 SHA-256: 2fe2de0eae5a98853daab6c590032aff56ab7b4f65338fadcbbbde6d38b61d3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nordicwalkingturak.hu/_user/file/78752477635.pdf In PDF document text
    • http://studiosiriosrl.it/userfiles/files/bokajoxugoligibevanosize.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/83137201586.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/95722334035.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zipevanixikerenadepunaso.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/puwefawijij.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/97153108510.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/40733315213.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/45466629471.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kakewezitamitafu.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65782262993.pdfIn PDF document text
    • https://bloomeng.com/uploads/wuxaferetasusazisotivam.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/lobujebasedi.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/39916140315.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/15466158199.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/58446052742.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/36398685187.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/99064312389.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/17172297216.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/33610415343.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/2788056382.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/goguradux.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/60183082710.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb70504b9---98181353382.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/tiramiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=genki+1+textbook+pdf+downloadPDF link annotation
    • 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_off0000c26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10736 bytes
SHA-256: 306ec226645bbd4dd6cd2c7a34748f5339ba65fa04713a6dd7c6f662b7e88a6e
font_02_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 18268 bytes
SHA-256: 0183fa37e48cc5833c1adedfa95177154c10ecaf7a4c84f4f4f4d4a4f3b31dec