Malicious PDF — malware analysis report

Static analysis result for SHA-256 371e5bf1759cbc17…

MALICIOUS

PDF

60.0 KB Created: 2021-09-18 03:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 10af00b2d974dfd2b5da749dd7674b86 SHA-1: 1e7a713890f76f677149a39101a90963bd39cc21 SHA-256: 371e5bf1759cbc17e58d4612e667e540edac113f300dd247e77f61ec5e730253
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. While no scripts were extracted, the presence of numerous external links suggests the primary goal is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8763

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 https://archism.ru/uplcv?utm_term=sentence+correction+app+for+android PDF link annotation
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/jaxujomilu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/kamibasopaxawolafaga.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/15303902852.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/kupatijuditixoni.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kobaniwig.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/62475811812.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/68671186650.pdfIn PDF document text
    • http://vln.nl/files/file/duvix.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/816394345.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/kilorabor.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/14028708396.pdfIn PDF document text
    • http://dr-temt.ru/images/file/69852732675.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jibisujirotapobesaxamira.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/70610381819.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/nepubaj.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/zaluwejoluxidude.pdfIn PDF document text
    • http://szhlfz.net/upload/badawelewexiladatuxofefu.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_122336.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wexegabulemesigukelafub.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/jipapesejitisilusu.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/16952854530.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/41284293929.pdfIn PDF document text
    • https://ever-progress.com/upload/files/satalovinulekijedomegox.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/bojawiraxagubefukir.pdfIn PDF document text