Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b579f58b2e781b1…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 19:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a0fd540d0aea6cec5b0d814dd683bcd9 SHA-1: ba109d1af96caba9959c9d6d0da41306475035ce SHA-256: 8b579f58b2e781b1d53a40e3c6975d79f89b621a279857b30aeef6e950e5a28e
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm hosted on disposable infrastructure, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. No scripts were extracted, limiting the ability to determine specific execution methods.

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/aws?utm_term=road+to+el+dorado+meme+format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404112/normal_5feed32943eeb.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/3898985.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/explain_the_purpose_of_writing_a_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fce76c656b25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391636/normal_5ffd107305a3a.pdfIn PDF document text
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/1339642.pdfIn PDF document text
    • http://jafalule.22web.org/kutiz.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/3080181.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/f9d097ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_602885704a24d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawolanuxoreg.epizy.com/67929743487.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/39415391388.pdfIn PDF document text
    • http://xavitemis.rf.gd/77101878224.pdfIn PDF document text
    • http://nipimixo.epizy.com/26506257024.pdfIn PDF document text
    • http://xejuzilawa.rf.gd/descriptive_research_survey.pdfIn PDF document text
    • http://zideniniwos.epizy.com/mariah_carey_emotions_song.pdfIn PDF document text
    • http://refedeto.epizy.com/polaris_360_bag_leslies.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 4884 bytes
SHA-256: 9d7b23b5f719034b16177a5d5ab494335ee0a47bdd4a8c6df9cd2a20a4c8d8ef
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 2060 bytes
SHA-256: 8c5f596b751b5df4f2110414aaa1c630b67d90a9bc37611b1def66c0a15a082c
font_02_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 11472 bytes
SHA-256: b78df2835c93bfdd6003539c2b1b2c4c3add2239cebeb5399baa6aa4bc37ba75

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