Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6fba250fc5011f…

MALICIOUS

PDF

117.6 KB Created: 2021-09-13 02:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0b0775c52d047e7a95333082e4f2b0fe SHA-1: 2ac7a1ec3f50638e63787644247d8f02ec3b12e2 SHA-256: ac6fba250fc5011f1f534d699653b816c949676627adfa885bac1e18684e3d6b
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for the redirection to the external URL found in the heuristics, which is a typical lure for phishing or malware delivery. The ML classifier also flagged this PDF as malicious, increasing confidence in this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6471

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=react+native+ios+example PDF link annotation
    • http://gocreate.termall.pl/upload/fck/file/zefedojowuwigisilatuwaf.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/62520347106.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/wexapedizesi.pdfIn PDF document text
    • https://partnermind.cz/images/files/kexedexixib.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/6677313736.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/42936785484.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/14010408492.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7371d582---xolaxidedipivexoxafokelu.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/kesopozogofut.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/46594187387.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/46167556764.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905110333370729.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/tobutirezawamiw.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/tabasatunot.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/jowalogusot.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/zapigisanige.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jogafazifetowixoxezuvez.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/dufuzatikositolu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/56645003150.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/97369128333.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210913060118.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/gotuzumived.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/81852259963.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/40902162831.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/69063410114.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lesetob.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000192be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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