Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af890c508d85cfa…

MALICIOUS

PDF

61.7 KB Created: 2020-11-05 21:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-06
MD5: eea7a2d629107990c5ef5a1e5cf29424 SHA-1: 60e5cdfd30eb6c406910d1421f4a0975fd4ecfc2 SHA-256: 4af890c508d85cfa4516d172ff8874ab149644d32a6e6dff14e65095fbbeda8b
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/wb?keyword=layers%20of%20the%20earth%20science%20project%20ideas PDF link annotation
    • https://pemezexuz.weebly.com/uploads/1/3/4/5/134585882/sodepawozelopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f95307f1da91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5f9553cca8d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_5f8b47437c92c.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/ddbd4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5f8ae8be33b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f8b0e62426d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_5fa366878627f.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/kavitokolezub/biological_effective_dose.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/histria_de_caxias_maranho.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/nexezed.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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 5332 bytes
SHA-256: 00c3fa5d97cf1f915ea8599c464a4b821cad762930b47fd53f356330a6981fa7
font_01_sfnt_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 11224 bytes
SHA-256: d8438364f7cb2885ce3c6873cd74fcaa45a6ea0e47f8f27952bbd160b750fb71