Malicious PDF — malware analysis report

Static analysis result for SHA-256 841499b687ba0dba…

MALICIOUS

PDF

63.7 KB Created: 2021-09-19 13:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5e7e9c86ca29fa4cdfe35054f0989daf SHA-1: 0dacaac4817d7bd23627fb96c803d8ef6c6caff5 SHA-256: 841499b687ba0dbaa355bdd3cd14705dd7265d2dcf3e27d9c569ac405b144c5c
124 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a link farm, with numerous distinct hosts and disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent, aiming to redirect users to potentially harmful content. The ML classifier also strongly suggested maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

Heuristics 4

  • 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
  • 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.otevrenysklep.cz/ckfinder/userfiles/files/53278159227.pdf In PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/29932332999.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/4395039175.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/12245233504.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/81684915569.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/jofaja.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ovilok.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/vuruwesadozos.pdfIn PDF document text
    • http://seto.cz/uploads/palafomakikewaza.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/22047783646.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/xunalejulumofefudele.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/feguresizedilatagepimimo.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/nudapuwobotipowuxu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/86518028892.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/kagav.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/sesaja.pdfIn PDF document text
    • http://shesob.com/file/files/vemisolo.pdfIn PDF document text
    • http://netflor.pl/upload/File/17686241458.pdfIn PDF document text
    • http://labsshop.com/d/files/86773194297.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/pabobotavabapolatozet.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0cdf48ada2940d8707e254f0441a17ab/35304794130.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/27234081151.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/zixatevepoz.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/savufepokebuxoxire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shiny+pokemon+go+list+rarityPDF link annotation
    • 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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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