Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1836b10d37136da…

MALICIOUS

PDF

49.8 KB Created: 2021-03-01 09:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c91252884491a6ccd761b072e1aa5526 SHA-1: 0658874d32947cefe0976fca497f23e2ac78ad25 SHA-256: e1836b10d37136da5a21e5e6fcdd38c1385f32fbe26cb18d6f05240795afae59
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6616

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/award?keyword=how+to+know+if+my+fitbit+flex+is+charging PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385631/normal_6016723f5f938.pdfIn PDF document text
    • http://salebobuja.iblogger.org/nujofilapamugijox.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/fopezanogava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c52c3ebd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_6022637101ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_60264857f300d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_602c2eb1cfb89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5fc6983f400fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_603bfc55eacb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6039d64d8207b.pdfIn PDF document text
    • http://fasidubeni.iblogger.org/55918667519.pdfIn PDF document text
    • http://lemujiv.epizy.com/bpi_ofw_loan_application_form.pdfIn PDF document text
    • http://faxunarin.epizy.com/66536064951.pdfIn PDF document text
    • http://masekafisixovok.epizy.com/babarimibovawasolaji.pdfIn PDF document text

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