Malicious PDF — malware analysis report

Static analysis result for SHA-256 23387a2149dcf9a3…

MALICIOUS

PDF

40.1 KB Created: 2020-11-07 05:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: ac5e776d877c1287348d5e46b221b841 SHA-1: 2b9454a4387dac11d03b2bb471cd525a016e280d SHA-256: 23387a2149dcf9a3b010a8e535fcf4a36534e31b1b6864b1e1925ef130c7b07c
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=2019+and+2020+monthly+planner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f9452e120048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5f90af992b5b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9533c8-2ffc-43dc-ad76-2307fcc35322/autocad_commands_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d124bd0f-7c57-4c07-a3df-7ec3e9cbc434/zetizewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077b8c6d-6f10-4d35-95aa-0e986a854d45/vigan_ilocos_sur_news.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1403f122-5413-4de4-a3cd-c67b8384061a/tididemekuginufuwazobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026071b1-4314-40c8-8a90-3a4f318f2c3d/7894190581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a619b90f-b8c1-4a2e-ad33-461c24d66b17/81230525455.pdfIn PDF document text
    • https://sizafezew.files.wordpress.com/2020/11/kazupotewuvuxalivitowud.pdfIn PDF document text
    • https://sixetum.files.wordpress.com/2020/11/96464594872.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://luvomax.files.wordpress.com/2020/11/31842874506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd72183f-06ef-4523-94eb-d1c66fd7e9b7/90427518745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cacaa3f8-dc95-415e-b912-3958d53184ef/vadepuremeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9791aac9-d1f5-45d4-850a-4abfbeb14b6d/milikujudogesagobokiforu.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_off00005d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D43 5508 bytes
SHA-256: 0b67e9631e0523ae9ac1b65f814e43aecdd154955af938bc258a89247ccd5c1f
font_01_sfnt_off00006fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 10404 bytes
SHA-256: a004bb82120940d5aabea046148769e87c84e5fcb33bdad1725672fe5e33b4f6

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