Malicious PDF — malware analysis report

Static analysis result for SHA-256 872d46649d79eefc…

MALICIOUS

PDF

45.8 KB Created: 2020-10-09 02:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2a5f0550332ec71edc06860fdfff1d22 SHA-1: 748b736cf44cfda6a13e3216de4b06eb2e0d0687 SHA-256: 872d46649d79eefcd41698f451c0f09a943889a5ab23187ea13ff0abf9db0c9c
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://cctraff.ru/strik?keyword=cold+work+permit+form+pdf In PDF document text
    • http://files.ginkgotree-advisors.com/uploads/1/3/0/9/130969985/0af407.pdfIn PDF document text
    • http://detilo.lancasteracademy.org/uploads/1/3/2/7/132740250/rewobokajejinij.pdfIn PDF document text
    • https://site-1043087.mozfiles.com/files/1043087/zipog.pdfIn PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/todapelureb.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/8bdf21e4-ca1b-4629-8075-15fe1d5574d8/nimurufamukofikur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd57d720-d372-420c-9a83-7d9816030137/96179288688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a50b64-8b14-4d6a-a859-3a5baadb3c20/71687552675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eba7eb-5602-4139-8835-d3fed9649ae6/jevewikukorefidekefutig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0f1dff-362d-4698-8ec1-087f533c7d79/kifedof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743f2f9f-e1a6-49dc-8b8a-dacd2310cf54/63371506709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7a3813-e3a9-40e9-8e1f-6c045012224b/ledow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878e7f8f-e823-4208-a11b-bd92e327c147/botilobuwageb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88af9965-9d91-4efa-b40c-6b188f6d5d65/gewovar.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_off000076d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D5 4860 bytes
SHA-256: 267cc6baede7ef6e13ccb0c97c38a8e626a3ac8e8a9b9a005d2dd990814f4fe5
font_01_sfnt_off0000875b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875B 10156 bytes
SHA-256: e5af896c2f2ce0264973a0bab35acf4f0b14b77edad2fefc6706fc337fc25dc1

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