Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c8868c947e0e75…

MALICIOUS

PDF

59.6 KB Created: 2021-09-23 03:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d95b6c9d20af3a3f7abf1f3dd7f22d2a SHA-1: c61b84b348cb0ef30ecdb137c6c5ed0bd519f278 SHA-256: 43c8868c947e0e75395add404eb23bcebe93db494213a6d7eeba628bb1e77f9b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, with a high heuristic score for being a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of many external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6081

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://brilsports.ro/userfiles/file///42118150144.pdf In PDF document text
    • https://duel.pl/userfiles/file/73902664570.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109102252428746.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/toxenuligotewovejomib.pdfIn PDF document text
    • https://granitnet.hu/editor_up/zixusudu.pdfIn PDF document text
    • https://matricula.arendic.cl/files/10492014196.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/5376287300.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/73167118746.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vosokojeduzunusizejutivo.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/39436874170.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_205109_104.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/wusefuvo.pdfIn PDF document text
    • http://sdes.in/uploads/kuvajekesigemakidijizar.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/duvojaralegupogozumido.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/622aa52386d4cba7b7a8d738c2e0b63b/95574473127.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/89220666418.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/53488712519.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/xajudawura.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/70109626439.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/56696826221.pdfIn PDF document text
    • http://prmakeup.com/Image/files/96028713722.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/suxajolutulugizatukes.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zejejij.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/74088129277.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tefakobafevowojireborerid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=appareil+android+c+est+quoiPDF link annotation