Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c2948c854f71fb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 22:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb717023a7cceab7031cc0e9f88ce32c SHA-1: 3ca54eb671378ebd4131c92d4b34f14b7ef886aa SHA-256: b2c2948c854f71fb4b774858b1e7d85de2326ae5b8705c6e19bb60cac3489405
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to distinct, potentially disposable hosts, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware delivery.

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://gibidesign.com/fckfiles/file/99257499621.pdf In PDF document text
    • http://busangh.com/attfile/fckimg/file///20210901233552_967840933.pdfIn PDF document text
    • http://offerparts.com/upload/files/siwuxoziwirolixuwijurudes.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/wabafexaxexukefosediguba.pdfIn PDF document text
    • https://birudongker.com/contents/files/80565256801.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/gajuvadojebomij.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/80005524807.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161360352898f5---rutenojozivedeji.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/liziwetiv.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pumexobukomeduteledogun.pdfIn PDF document text
    • http://mlight.cz/archiv/file/miwafipudikosi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c86e715ad---66711312426.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/99924737902.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/5129242885.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/6346356052.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75313605984.pdfIn PDF document text
    • https://0900107678.com/upload/file/30031092427.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/4718736198.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dunigato.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/86758284574.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/7443048584.pdfIn PDF document text
    • https://ms02bet.net/contents/files/69751508915.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/37481380934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mediabox+on+firestickPDF link annotation
    • 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_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 10748 bytes
SHA-256: e85ccdf5d24ab4c18dd992495fe320188a9e78ef4dacdb16560b678d53cffeca
font_01_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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