Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a435d6a9a9bee4…

MALICIOUS

PDF

54.6 KB Created: 2021-09-13 20:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4efaa808da0373965856891077170022 SHA-1: f32c246950cdac906a76ba495ac89c7a4acc8db6 SHA-256: c4a435d6a9a9bee47c1c64093b05b5668e5fd0b33e8d505405b433500a2ddded
124 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF structure and the presence of many distinct hosts with few links per host further support the link farm hypothesis, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8456

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://chcial.ru/uplcv?utm_term=hack+mod+game+apk PDF link annotation
    • http://gusanhightec.com/userData/board/file/45021887495.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/7768354842.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zuvodavorixugavu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/97144793475.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zemug.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/xiwosofa.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/98178117493.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/30670683336.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/tijojefowufuxepilivu.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dopanebaronotewesopejux.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/57249947145.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wewegetoxuga.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/286172091.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/55067679113.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/gopamezigifudogojumaz.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/13142695433.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/54840734456.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/sawaxirojulozipasebiw.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109120632526964.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/9250397201.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/papofe.pdfIn PDF document text
    • http://nktrading.qa/file/files/xekamejapinojetulibej.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/47542868489.pdfIn PDF document text