Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b56a6e0a8e6ff0e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 08:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4335df62e0fd3b030761c9fd80d5601f SHA-1: ee649e6767272a631ddde5c649d70f9edb14cfc2 SHA-256: 8b56a6e0a8e6ff0e051bd4fb94cb650fd270bb847325a7284275bae1cd1cd795
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous links on disposable hosting suggest a phishing or malware distribution attempt. While no scripts were extracted, the document's structure and embedded links strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=road+runner+beep+beep+sound+free In PDF document text
    • http://sunufosabupes.scienceontheweb.net/40135077217.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/hbgUFn3/cardboard_boxes_home_depot_canada.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/mopoma.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/djhOjed/gimovopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5fe54ef27fd6b.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/the_wave_arizona_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_6029feea341db.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/83502169481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_60405bfc0cff7.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/614c1b8950d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_601e05c45a2ee.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/cd0b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rolubumemetujin.atwebpages.com/apophthegmata_patrum.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/dead_sea_scrolls_translated_into_english.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/carpal_tunnel_exercises.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5148 bytes
SHA-256: 646087eadc18f68284034f8b36c807b08977ce2f1929455228d4bfe9f6aa4816
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 12108 bytes
SHA-256: a55c9a979328e647b07a69ef0c21a3b87defe2ddc841e5cb286dc20456715d74
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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