Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb91a507efad728…

MALICIOUS

PDF

36.3 KB Created: 2020-11-06 15:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 8021d2c6ca06149586c85ff25b0178ed SHA-1: 458dcb0a139a1bdf7c52630235a11560fc586b31 SHA-256: ebb91a507efad72843a06384a13166ecefeec96b834b8a5fbdbfb1a21713df5c
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?keyword=simplifying+radicals+worksheet+1+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f886b3b9a691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f93b5a768886.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7775416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f90892c1da7c.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/fojaxexino/vakitivarunemizobor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6449/0687/files/6168548358.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/google_doc_templates_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a71110c-8a3c-45b5-b717-87464c00ddb9/81615448182.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/zubapepem.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/javevadopunogimuwijomu.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/ginudok.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_off00004db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB2 5980 bytes
SHA-256: b6813242024b35348864758a6fe57e0484408a2fc76933f9ebc34d2dbf7177cb
font_01_sfnt_off00006209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 10092 bytes
SHA-256: 94649c046802f5c53fccdd3a36018b5e6bd845cedab6ed09168d88d40b8e2ba5

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