Malicious PDF — malware analysis report

Static analysis result for SHA-256 770e10be44d11053…

MALICIOUS

PDF

95.6 KB Created: 2021-09-19 12:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bf5ec89cce0e500777f3d93bf6cd16f SHA-1: 9ab5100bd967b275daba25fa438bfc2a5a8ee3b7 SHA-256: 770e10be44d110532c6970160d4af6be964109f6fdae41d9cb32be612ef163ee
102 Risk Score

Malware Insights

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

The sample is a PDF file identified by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The presence of numerous external links, including one identified as a link farm, suggests an attempt to redirect users to potentially malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4272

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://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/dekuxufegabaripig.pdf In PDF document text
    • https://ontogepszerviz.hu/editor_up/97300332764.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/93032474690.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56585575578.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/vumujilapizafazopexiliw.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xemivilupozugozekudopol.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/7975176794.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bimawupexabategipefesa.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/31939843837.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/16632979072.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/57203297487.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/83203471102.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/mimewi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba74b619e---74528033042.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/jozolexokawavelozeref.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613739e77f3ea---janubuzuwonajup.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jiluxi.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/90718998972.pdfIn PDF document text
    • http://www.siposferenc.hu/html/21629171246.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/2462559556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+boruto+episode+180PDF 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_off00013f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F05 11076 bytes
SHA-256: 943c9110b05641b9e7042c7def38cb041cce621be0de72f8753a83cac2ff17e4
font_01_sfnt_off000158d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1