Malicious PDF — malware analysis report

Static analysis result for SHA-256 df03c9b4dbe75d81…

MALICIOUS

PDF

46.8 KB Created: 2021-09-26 05:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43bde77f761adab8ae66414e9659890a SHA-1: 854c1dec09736c36c5a6fe12fa377c08b3959f38 SHA-256: df03c9b4dbe75d8198dde7af7c492843ef314212b898c8811022703b5a06fc61
124 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis identified it as a link farm with numerous distinct hosts and disposable domains, indicating a likely attempt to distribute malicious content or phish users. The embedded URLs, particularly http://dtyxbpzx.com/filespath/files/20210906051045.pdf, are central to this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7740

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dtyxbpzx.com/filespath/files/20210906051045.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/90049556724.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1541d048---35805331873.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/23601535240.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufig.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/23151921995.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/10548638231.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/25817366484.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/39342158865.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gulotusakatosixitox.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/40401263489.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/29712543116.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/84753228409.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/31712121384.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/84563360322.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/28038745724.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/fumugizuzeneraxojoxofivox.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/pulibuketu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rizowugonilaxobozaxen.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/51793519509.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/66008620311.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/46429472870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=secure+mode+androidPDF link annotation