Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ca646be281fb91…

MALICIOUS

PDF

71.0 KB Created: 2021-02-03 08:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 72d03dc91f51fbbb1a48ec5b35badd6c SHA-1: fae8c9df759fc189a3f29959014c341ca761d078 SHA-256: e2ca646be281fb9110089c95a82a13b4c7f12615c404b40e4a4d57fd6303b3d2
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a link farm designed to lure users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, and the heuristic rules confirm the presence of malicious redirector links and a link farm structure. No scripts were extracted, but the primary attack pattern involves directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=through+the+fire+and+flames+guitar+hero+expert In PDF document text
    • https://tugagofinose.weebly.com/uploads/1/3/0/8/130874012/1d0aa0.pdfIn PDF document text
    • http://bupetud.xyz/scorestream_high_school_basketball_court_dimensionsklwar.pdfIn PDF document text
    • http://siondez.ru/tree_diagram_for_probability_worksheetaajsr.pdfIn PDF document text
    • http://price-list.moscow/fodalawajurikue.pdfIn PDF document text
    • http://lianhua.life/sijeraketoslix69.pdfIn PDF document text
    • http://radanews.site/7196656033739wm.pdfIn PDF document text
    • http://electorat.org/residence_inn_chicago_lasallefb1sm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5ff17f935e36b.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/7YTjicy/95733295142.pdfIn PDF document text
    • http://intereriia.com/libros_de_nutrigenetica_y_nutrigenomicas7ghq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495536/normal_5fdebbca6efb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fd8b449e0b09.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/d469gfv/13296920727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5fd0ac78cdc09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 5472 bytes
SHA-256: 04cbf32d1c122b8c0f2206eaa9d778eafbb4b15398d634911d3bfc6cc8a2ad3d
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 10252 bytes
SHA-256: cf486b4ec7d7a12aaeed3f0a48201c9cee739b4a40e84d6d39a9e308774cf84f

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