Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb54733006b7b479…

MALICIOUS

PDF

62.3 KB Created: 2021-09-14 12:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6be7b61fbba196fe4453c691a9f8fd25 SHA-1: 9e56dd4bee4840105b33f497d81ad98feecfdec1 SHA-256: fb54733006b7b4796da6004311fd05d24253a4e38f358e3f68e4ae3218f43fab
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. This suggests an attempt to redirect users to malicious content or phishing sites, likely as a lure for downloading further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7661

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.
  • 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
  • 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://allytemp.ru/uplcv?utm_term=android+12+widget+kwgt+apk PDF link annotation
    • http://lightningriskassessment.com/ci/userfiles/files/miwer.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4e30e534---15227411223.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49i12rucupjsv0tvlr9v0vodq0/naxekupobizaxufag.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kuteped.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/77252548491.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/kotinemomarotosikoxebo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/69838086501.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/9653963949.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/87494967107.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7evhi7s5lgvmna4tali203n9k6/50129931477.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/7228801574.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51442999740.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/jogulojixitegetar.pdfIn PDF document text
    • https://sitarasign.ir/data/file/57340294649.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98618341919.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/35191668118.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/milakinidugevupa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fokavokig.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/pewaseparobanuredal.pdfIn PDF document text
    • http://coolscape.info/images/files/18700698025.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/20165472450.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/fowuj.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kisog.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/9972499880.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 10684 bytes
SHA-256: 65748fbc2725ff442ea3ec3cd7fd18d204d3558bb782f739fb2700617ccb77e7
font_01_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1