Malicious PDF — malware analysis report

Static analysis result for SHA-256 c723560e087bfc73…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 04:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fe295f01daf2c76ccd5ee261fc01642 SHA-1: bdfa0d3ed97c8d2146cffc5cda6685ef1821d0b1 SHA-256: c723560e087bfc736970e5510759e667d4296c96111c0d960ac1e56368c64678
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+sync+chromecast+remote PDF link annotation
    • https://smshealthcareservices.com/ckfinder/userfiles/files/4385187003.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090308075173499.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/72782735024.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/91971443987.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/44495970984.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/luvudadijusekupodagojakoz.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/38482881525.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/nodovukoveremiwodedudazi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b519f62c9c---duzefivepalavuviwipekida.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/gonomerofobawubebapenak.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/fozonosol.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/javipupibutoxeneb.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/2760366367.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/86461073528.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/93565661991.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/37493097112.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/renalifuxusesumadevefa.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/76777737857.pdfIn PDF document text
    • http://saint-party.com/media/file/68408225348.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/51234526776.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sotugijuguwinipuwemifu.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/pasoxaxopulij.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/44505506838.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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10548 bytes
SHA-256: 2a16b8e8be7b2b0b40722ce335dfd73f34cebb85a8b7de2ca45da23a4ba989e7

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