Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dc4b8e50d42029…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 12:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e3dd5d281aa093a79f520dfb8c0a4fd SHA-1: d03a823004a375721fc6328d5baf38c34faf957f SHA-256: 10dc4b8e50d42029a64a0215c90a0af830f56d6fd23e19cb47af441c18acdcba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs, many of which are associated with file hosting or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ecableapp.com/FCKeditor/FCKimgUpload/file/xulozugirijibiga.pdf In PDF document text
    • https://mogilew.ru/userfiles/file/80981207532.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/gekuxerafopidi.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/junabivi.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/80507921931.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/fifadunijupokalaxit.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfe4b7233---nibuvuputiv.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kugewilunuvira.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/72923132343.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/runumuxozar.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/15040622601.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/betedel.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/lodejojuzokajuz.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/nobugivagukuravugexipule.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/josuviwagavokajume.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/nokelejidiguletuwuno.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/ladufotubinumelixirafuzof.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/36003389198.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/99055524748.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://centonze-vini.com/userfiles/files/7586296293.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1860e1e56---julebirudut.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/39516542072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=image+picker+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 10588 bytes
SHA-256: 07def5ca8f6bea7a79bcf86a664a9afdc2cddc345b9f156421b85bee87c01298
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 17056 bytes
SHA-256: 84bb2733e53de4061f7a168e78a555447bb2069d659b51e7014e6e7fb7dc95b8

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