Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e2398bd6ec1d5d…

MALICIOUS

PDF

37.4 KB Created: 2020-10-07 01:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 764f5e50d7e1156fc54213ab03a81b4e SHA-1: 313d5772bb38c27099eb5b289af5553ab6d57316 SHA-256: 25e2398bd6ec1d5d73dbdd5cbe114f99153aaa550885c448db1ac06413449b06
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=physique+du+solide+exercices+corrig%25C3%25A9s+pdf In PDF document text
    • http://denarijod.catalinacastells.com/uploads/1/3/2/6/132683085/1243061.pdfIn PDF document text
    • http://files.juliesoliloquy.com/uploads/1/3/1/3/131398489/suzobidi-senejomafavu-xuvugal-kekijonagejapa.pdfIn PDF document text
    • http://files.coffershousingsolutions.com/uploads/1/3/0/7/130738850/ramajole-bifaranizadit.pdfIn PDF document text
    • http://files.revmelodyann.com/uploads/1/3/0/8/130814467/93257.pdfIn PDF document text
    • http://files.learningtoolsllc.com/uploads/1/3/1/3/131398194/9492891.pdfIn PDF document text
    • https://site-1044066.mozfiles.com/files/1044066/pejunesibilerom.pdfIn PDF document text
    • https://site-1038707.mozfiles.com/files/1038707/vewibikitiviwovixuju.pdfIn PDF document text
    • https://site-1041858.mozfiles.com/files/1041858/matalalupawewug.pdfIn PDF document text
    • https://site-1039487.mozfiles.com/files/1039487/74683524474.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/1f0c27ce-433b-41ac-b6e5-23baf1d92a8a/41557034315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20a9ae5-9347-4337-a9b3-4289473bb5c8/fidokudagujuxope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9cdd07-bd3f-4df3-aebb-8afab01d40d3/wirasulew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14690c27-03a9-43af-8757-e7b29748707f/remewib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c669f728-0db7-41bf-bdb7-a1f380ec102c/59686712793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf53c6d-4a09-4646-a578-133cd40c2c69/44592063203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7b1727-33dd-4a96-8edc-a51cde1a0402/99861217655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c973c57-257b-4173-a79c-7a8a942641ce/rexofe.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_off00005167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5167 5644 bytes
SHA-256: 6daa5d51498d2c350c19a9b4607641b0c2755f8e602b4c8376a67eb4be3f0eb0
font_01_sfnt_off0000645f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 10396 bytes
SHA-256: c6673b24bd1b9f140d59a0a0e6155a0c524672857bdba7d6226eabf82f97ead3

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