Malicious PDF — malware analysis report

Static analysis result for SHA-256 847c9f31270462f6…

MALICIOUS

PDF

71.8 KB Created: 2021-01-07 23:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-04-05
MD5: 1bc850f0150c49e7640413ea62c89c61 SHA-1: 47d297c71a3ea1e4d2270fda499cf5abb2f4e26d SHA-256: 847c9f31270462f69b720622f363e669a8b7b1667455d9231a79afcdb115b66e
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cdn-cms.f-static.net/uploads/4419002/normal_5fb466e2c9855.pdf In PDF document text
    • https://s3.amazonaws.com/zewimu/fabilozojenafemejitubi.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/noncash_charitable_contributions_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_5fc12c21ca1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fae56e47db38.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/48107224265.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/13258309829.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/faburojalefolakivipel.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/5c82e4f3ac9f.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/end_of_year_math_projects_4th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5fa5b21a6a0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5f9e28f2294f3.pdfIn PDF document text
    • https://trafftec.ru/123?utm_term=race+face+atlas+pedalsPDF link annotation
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000d98f.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000d98f.bin)
    • 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 extracted file (font_00_sfnt_off0000d98f.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 5060 bytes
SHA-256: 425c68c82ed08905a58a1dd9ba7a51d80df48151c2dfdf364609f6efffdc07c1
font_01_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 12108 bytes
SHA-256: b288f772fe507b25a4428a374777fa5867d8a48223908832af7726e79bd9b57e