Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdfa45c64830199…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 12:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1645314d82ab26ad6c8d47bdcd8d0cd1 SHA-1: d15e2e0a56bd9cacc6c2b00e9b7a76bc0f5182f8 SHA-256: 2cdfa45c6483019922ea8f453848eef3fb5e528887dbc8a6a7642bfb7b62efac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that redirect to various domains, suggesting a link farm or phishing campaign designed to lead users to harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6613

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 https://synerhu.ru/uplcv?utm_term=watch+monsters+inc+movie+free PDF link annotation
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/galejovurabit.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fofupakazuxifalemux.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/7611001731.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ab9c37fd---zadodinutemopovik.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/63625279396.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/samolibidomuvovavafesi.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/xobirikutidut.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/guvoduriwine.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/vanowapima.pdfIn PDF document text
    • https://naves.cz/res/file/55876979063.pdfIn PDF document text
    • http://artospace.com/pics/file/20752925044.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91887331946.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/95847727571.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b662d391---pipusanufefira.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/makikobilawufi.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/mevafud.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/ponepewovuf.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/ladafojenigeriketonas.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/53134490635.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/dazuvitubexazul.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/43437591362.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/tigurejo.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/tesojafemivebasefutijos.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95536382386.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_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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