Malicious PDF — malware analysis report

Static analysis result for SHA-256 a745fb2587e49420…

MALICIOUS

PDF

43.1 KB Created: 2020-10-09 05:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ca236c7408e76aa473998bd48c6a77c5 SHA-1: a4274df2ae0bcb784c5989334864b40603406b88 SHA-256: a745fb2587e49420361e1e3d9a1e6873af295db37d9e6a9b7c745ab3327460ec
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/strik?keyword=pyramus+and+thisbe+story+pdf In PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/98938835463.pdfIn PDF document text
    • https://site-1039765.mozfiles.com/files/1039765/39022147937.pdfIn PDF document text
    • https://site-1042988.mozfiles.com/files/1042988/wijidugogaziwe.pdfIn PDF document text
    • http://files.wellbeing-at-bethel.com/uploads/1/3/2/7/132712080/823976.pdfIn PDF document text
    • http://files.staragricultureproducts.com/uploads/1/3/1/1/131164032/bde9fffd2f.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/30983485080.pdfIn PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/52865196809.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/palifevurotufiwaromoxovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9e3ad5-bbe4-4e36-b76d-910bffb97859/ridatetimifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e009b26-7b91-4fd8-8206-9b886ac37ba2/97848394769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbd25eb-c484-4c29-a2a0-07aa7b78f13b/felejaxiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c49f39-6145-418b-bb4a-0e6b9f007306/73462458743.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_off00006973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 5492 bytes
SHA-256: 9f696f9e1849a58dae70b7f40ce924ca049f7b3f961b39cfac45ca2ebd742b95
font_01_sfnt_off00007bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 10840 bytes
SHA-256: 0abc91644fe5e4ecdeb9b582d4c13a8124d0c1616bb128fb1ae94792573507fc

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