Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b87725529d9acc0…

MALICIOUS

PDF

49.3 KB Created: 2020-11-08 13:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 813ea86ebd67688f6178503a760b9420 SHA-1: 6995f7fe721c145ba15bd0019f0e129be52b09af SHA-256: 4b87725529d9acc0d21af28e5ce7853db5ec97a0974a18cf6f1458b4c1f6e930
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffset.ru/123?keyword=3.2.8+apex+spanish+semester+2+answer+key PDF link annotation
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/javisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f9999f771197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5fa548f2036eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5f991ae7b44d5.pdfIn PDF document text
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/zonigitadifise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/zadijuwusenamebupap.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://xixunetov.files.wordpress.com/2020/11/pomeranian_breeders_in_pennsylvania.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/basic_civil_engineering_books_download.pdfIn PDF document text
    • https://riroxoposej.files.wordpress.com/2020/11/employment_application_form_california.pdfIn PDF document text
    • https://sazajade.files.wordpress.com/2020/11/fefofapexadomak.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_off000080e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E7 5780 bytes
SHA-256: 353d6be48740db76ed3d76cea63baaf0cc94d9578573804bbac3efe9ecdc77f7
font_01_sfnt_off00009487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9487 10876 bytes
SHA-256: 011719ca265be8a697451e350c0a0928eb7872a2aa76ed74ce885ad0292bcd1e