Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0252139dd3a13c…

MALICIOUS

PDF

40.5 KB Created: 2020-11-09 15:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: ac20e3568ac86e25401ce3f309d28cec SHA-1: 86604cff2da9bfe222a4ef26f0c3ebe80661adad SHA-256: 3f0252139dd3a13cc4ba96ab22ef485d8d78225d76f9174e6abbb200a51230b0
136 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/123?keyword=anthony+johnson+actor+movies+and+tv+shows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451737/normal_5fa8e6d69f436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f96fbafbbaac.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/3653679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468843/normal_5fa306d36aefa.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/salozu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5fa53990e2e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_5fa77b5677589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8a9c7e292df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5f9db40045b48.pdfIn PDF document text
    • https://nigefawami.weebly.com/uploads/1/3/4/5/134598638/2035217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5f961dd8bbdf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f90b4c7766fa.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_off00005d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D65 5464 bytes
SHA-256: 77cfac60f69e3c1d25a3c876bb170d5ab72bd7b1386b4151f7e226745ff398f3
font_01_sfnt_off00006fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FED 11036 bytes
SHA-256: ece263c9de1aa976d87658523121be330816282d61e456ce1c467b9af6726dcb