Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda81c9d11c513e8…

MALICIOUS

PDF

78.4 KB Created: 2021-06-04 00:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 77e3f86e9a03fe5052045c30eafdbcfd SHA-1: b78497c6ae0187ed643ba5894af0c6aec8dd2003 SHA-256: fda81c9d11c513e8335d97fecd6a6417f0051fa0356d6c7ea60a98475b70d352
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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://soxebez.ru/123?utm_term=cessna+414+single+engine+performance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ff0f342bdbe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5fc85e20e13dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6068d19d44bdd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4480898/normal_60b06271f1812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_602e1464e87c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_60221827ae392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_603d400eb477c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visetululiv.pbworks.com/f/magnavox_universal_remote_code_for_tcl_tv.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/pumidogomogapukef.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144544731/zifikatukefanedelufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02dedc4-6c7f-4fa7-af8f-db59d5348be2/murawekejubakegofom.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/sine_cosine_tangent_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7166a34a-377a-4352-8195-fa980e880ccc/nesco_pressure_cooker_seal.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/f/job_application_letter_sample_for_fresh_graduate_teacher.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144426909/xuzufelo.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144484008/kuxovasixapekikim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f110564d-2a6b-4578-bcf6-07acbf4d9d62/ruvizoropusivukawi.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/coleccion_manolito_gafotas_completo.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/wuxemenebigilufageg.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413262/38181078302.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 5380 bytes
SHA-256: 4eef4c8e25db002407d69e1f7b8ffed21067ba4056afd970af547cfc0a2b63bb
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 11080 bytes
SHA-256: 234748b4dfe3d81e27181e107868318a04f245ae04b484ed590b9ff14e405df8

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