Malicious PDF — malware analysis report

Static analysis result for SHA-256 73625b916b9c8b6d…

MALICIOUS

PDF

67.3 KB Created: 2021-02-19 13:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4c5fda5a07388cb7f951a6a20b714a62 SHA-1: 7bc1dd5f7979ff6c988f6184f87b1fedf86087cb SHA-256: 73625b916b9c8b6ddc27c26eb01e7ba7abae5b9aa0c20d4a32d14edaa51cece1
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to disposable domains and appear to be part of a link farm. The primary URL suggests a lure for downloading software, specifically 'Reiboot free trial download'. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the extensive use of external links and the ML classification strongly suggest a malicious document, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8507

Heuristics 3

  • 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://jacksth.ru/wix?keyword=reiboot+free+trial+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fd3063adafe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_6024844a88d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_5fe6ecee670f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_601b609b927f3.pdfIn PDF document text
    • http://idem-peshkom.ru/46698049463uhb6n.pdfIn PDF document text
    • http://fusegufuw.iblogger.org/altivar_atv320_manuale_italiano.pdfIn PDF document text
    • http://konsalting.info/silebikudisitivufesijelijerxq0.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/aDrgi2P/spaceflight_simulator_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_602aa5ee58cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fe6342bb533e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5fe2a31b11109.pdfIn PDF document text
    • http://lojasamericanasbr.com/90907788201iagz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_6000a03dbcd4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5ff692edbe40f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_6002828ddeede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezajezo.epizy.com/zuletofizepogadafagemopi.pdfIn PDF document text
    • http://rugokabiko.epizy.com/archive_of_our_own_series.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/komopikegifoki.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 4960 bytes
SHA-256: 7020e762bae5ebef00ea3ccb8e5cf4cdfff53a70ac6e0f337918d09f86a400d7