Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d09b33fbe1eaf74…

MALICIOUS

PDF

62.4 KB Created: 2021-09-21 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a37d49a505ad3c1b7fa5158a4612899a SHA-1: 2ca4d7eb7cc6a69e91f803c85a606fd4e6469260 SHA-256: 1d09b33fbe1eaf74a22a90318e139d3651f1ef101b8497475c68b6040221f136
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate redirection or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9091

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://krisoc.ru/uplcv?utm_term=twelfth+night+as+a+romantic+comedy+pdf PDF link annotation
    • http://holidayinntorino.com/userfiles/files/perawikuvitumulujebo.pdfIn PDF document text
    • http://debten.net/UserFiles/File/relukevimirigazalafivex.pdfIn PDF document text
    • https://sharenkon.com/files/83299693824.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/46808845012.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/sadipaguniwamatefanumanob.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/90944552028.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/pogodeduguxopazetapa.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/zerefadiju.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/fewexazodipufoxegulox.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161357d70bc40b---buxirerawunegel.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/motegoviporu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a25f70bbb1a0b3cf3192bcd3a72f4e2f/84441669405.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/gomow.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/xaziwusovisutenaf.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_235316_9165.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wujarafipukesafizipas.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/rukix.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/29749865247.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/7283608995.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/97169622773.pdfIn PDF document text
    • https://0900107678.com/upload/file/xefetu.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/tezesizaja.pdfIn PDF document text
    • https://t2sc.me/userfiles/24664571821.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/35264767963.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/duximevopipexixu.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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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