Malicious PDF — malware analysis report

Static analysis result for SHA-256 348221bc6d061154…

MALICIOUS

PDF

51.4 KB Created: 2021-09-30 22:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ab098eb8c9123cf2e4c0252a9d07179 SHA-1: dc6a142cb0fb78403854bbc9077fa586a97e2bfa SHA-256: 348221bc6d06115461ef92d18651dfc1c33d978c7f5a7cd01ce13f2d1434d5d2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to redirect the user or download additional malicious content, contributing to a phishing or malware distribution scheme. The numerous external links, many pointing to PDF files on various domains, suggest a broad attempt at distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8891

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 http://vizit-k.net/uploads/editor/files/nilizujujesowof.pdf
    • http://dh-life.com/ckfinder/userfiles/files/83217810415.pdf
    • http://supragyn.cz/userfiles/file/nudopipuzabexalav.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6ce8f378eadd7d0715a699afe0f9d82c/51439992149.pdf
    • http://agnieszkapawlik.com/userfiles/file/lagaxigotajudarupoxabut.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/ketave.pdf
    • http://tnslib.tools/userfiles/files/dukak.pdf
    • http://alisawedding.com/upload/users/files/xileratumele.pdf
    • http://prasongp.com/file_media/file_image/file/pikodasizipipox.pdf
    • http://madmojo.com/fckupload/file/lemube.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/17987716026.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109111610516496.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xijomojukuxepazenakoso.pdf
    • https://dacola.com/upload/files/fonotinebo.pdf
    • http://leaguengn.com/userfiles/file///butaxegatamok.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/supin.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161542f275a671---zatedumu.pdf
    • http://autofactory-jin.com/js/upload/files/lulabefu.pdf
    • http://jjkxmy.com/upload/files/202109051648041454.pdf
    • http://jor-agric-aqua.com/user_img/files/46805094699.pdf
    • http://siddharpeedam.org/userfiles/file/
    • http://cecev.com/stockages/files/89309102873.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+ping+tools
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b512.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 16792 bytes