Malicious PDF — malware analysis report

Static analysis result for SHA-256 85162a21b82317a7…

MALICIOUS

PDF

81.0 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: 43d4635e1198d519618877cd0c530941 SHA-1: e0212ce5da290b8a42035282d3c25e4c0c835d91 SHA-256: 85162a21b82317a78c7d1e28acbc96e07e7cffe368bf16f58b68a3eab8e2bca5
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to download software, possibly disguised as a free trial. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

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
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 10364 bytes
SHA-256: aa57f7b00479c30a4386c04fe77e914a942836276749f04f7cdfb8bc3e6270ea
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 16160 bytes
SHA-256: ab862ddcc36e5f8abbcc0ec12f45ee2a0a0017beba85073a80867d3ee452b16b

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