Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ca3709752af60a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 03:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e7c489a61a762490c34b89014bd4a08 SHA-1: 9892ee90e5e1e4f7725f724522c0eda1761e5dbf SHA-256: 71ca3709752af60acda2706fb723074415ec8e2dd0449dd40433161b7fc8380e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to external PDF files on disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5559

Heuristics 4

  • 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.
  • 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://platypusspot.org/uploads/ckfinder/userfiles/files/dosafezeripe.pdf In PDF document text
    • http://kokocurry.gm/userfiles/file/50201538215.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/kitoxe.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xazoxibufesoguvalazegesu.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091306241063.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/berurirudewi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/99413702992.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67805139120.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kojupemi.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/47819623662.pdfIn PDF document text
    • http://sinners-party.de/media/file/44357760021.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/fonafo.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/29281903251.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/girazafanifaludadobipe.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/xulix.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/bomezulomonepobebavujito.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/192530173.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9l8o1lub0t3i9v1k5ibetulbi3/dukepupotevupag.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/gemodanowobosasi.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/96516111477.pdfIn PDF document text
    • https://langumeistras.lt/i/File/jefiwu.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/wuxixinenalekojatunuru.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bavolijerirageteborajugag.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/rijuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ram+full+moviePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 17484 bytes
SHA-256: 183f5c3aeca95c3ddf28db7805d232ffc7637bfea5e430de5d595c8ad12e9619