Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a4c8cba1bcec4d…

MALICIOUS

PDF

41.6 KB Created: 2020-11-08 13:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: cabbfbd020b29a408b3c13cab208677e SHA-1: 854d277276203ba226a4a1a491b1a79c29459490 SHA-256: 75a4c8cba1bcec4d86da0f706e4f3d6ba3218b045a0616cd452d54cec9e8df29
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/aws?keyword=gravity+falls+season+1+ep+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406789/normal_5fa447b460c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f8e5c4027f0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_5fa352958e369.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/laziburik-kabezuf-limerulinatud.pdfIn PDF document text
    • https://tibesegekor.weebly.com/uploads/1/3/4/4/134495245/fixigama-fulufelifed-rizabufoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5f97e0f07e832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f98e5165f99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_5f9da70bd3281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fa4a0c6f26d0.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/fapaga/game_design_document_template.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/chemistry_textbook_for_senior_secondary_school_download.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/dajimedexukofijeb.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/81415987382.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/fuvodewilozanisuvikosuf.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_off0000642f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642F 5296 bytes
SHA-256: 2a56f0d0b3cb026f55648c9b3d71f49c1b27761abe7d97600924873ff617d506
font_01_sfnt_off00007659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7659 10516 bytes
SHA-256: d7297db6adf1fc421c1d627b773bdd80a1402e3e8f1e9c4b634f4e07f3d8875f