Malicious PDF — malware analysis report

Static analysis result for SHA-256 3525b15bbb5ee660…

MALICIOUS

PDF

62.3 KB Created: 2021-09-28 13:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a3c6ae609420f14bc2e7d2bb882670bb SHA-1: 5429c5a54b05e6fc1f286097a4e6f868f7dde89a SHA-256: 3525b15bbb5ee660591aeaad78cc02ab15b21774038654f17dde38f04cce6125
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6459

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://vce34.ru/attachments/file/polefusigowuze.pdf In PDF document text
    • http://newgrids.com/userfiles/file/39441414917.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/wasotujoxudif.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3b451f66d2983ac52f4e562e2107676c/sutorigetezunebosexaxok.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/89454029328.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/13258037944.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/47141679167.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/9376425081.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k14tifjcg2f87uhjl8eso27o95/kibesagolod.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/23409450187.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/bokipewutarabekuselopipal.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/85862932566.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lokorefibejev.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/79699067334.pdfIn PDF document text
    • https://ysh.my/userfiles/file/87750396180.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/xizufadona.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/86054533320.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/26391932279.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/66245573349.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/81810738179.pdfIn PDF document text
    • http://htwy.com/upload/file/moruxitoginepuka.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/zuwinuxemozasa.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/nofusepamawokiduvokimezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+multiplayer+apk+obbPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/48910339442.pdfIn PDF document text
    • 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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 11036 bytes
SHA-256: 2b9d4a99fd88f0015eed3e9ff6c70f0dd3822dbb77f80a3638b25aaeddc6108d
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 17340 bytes
SHA-256: dcf9353da70c58e5a1809ca94965be88c4549e7936ed952ed18c59e9989a5b46