Malicious PDF — malware analysis report

Static analysis result for SHA-256 0276bc07c38de39c…

MALICIOUS

PDF

63.1 KB Created: 2020-10-16 23:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: c557a18050025e5c22350fa76b252678 SHA-1: dc9c6c154ffe8d91deb40ed1d51d3a504c140750 SHA-256: 0276bc07c38de39c68cdbd541d9ad8c44363cb807266b3f6be0443b5a4408386
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?keyword=atomic+structure+engineering+chemistry+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f87046721816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f879e23f1a2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f88dea020df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f874dfd35a92.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/wudixepumaxun.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/29a01f541f658.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/3828656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f883185ec477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f89059d23ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f883c07cab10.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f782a6b1-696c-42ee-8586-ac4b524b0265/51159073812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6eaddb4-dbee-471a-a15d-884e6dc3a544/91928525496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4476cf03-44ea-41c7-bf7e-28907ecea1c3/gofojifamuxozeziza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eaafb1f-7f7c-4f17-9a47-1b6affee3592/nokibogaren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47afecdb-b185-409a-b92a-438616bed24e/63096382360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f9387d-2328-412e-8180-7731dea68220/43294013776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ee1ea2-c29d-4b4d-997f-1ba1ebc3dd2e/xuberixewebov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6f296b-dbe5-445f-8977-cda47ff8d85f/78541126344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59da7417-f418-4974-8589-44f47d8919c3/40071436898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02a5c05-f804-43f5-8d4d-fa0fc4ba87be/xexujogubegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c951f57e-1463-45c2-a36f-b77dfe349856/gidikawegevupometiwipalu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9246 1776 bytes
SHA-256: 97f3be78c57a291454b4057466c28e01b5b5f2c56a842a8db0813509cddbe621
font_01_sfnt_off00009b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B04 5300 bytes
SHA-256: 123b806af2d304ecf28e872df91e1540ba86a9c49d8be9e2c68372b88329166b
font_02_sfnt_off0000ace9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE9 15732 bytes
SHA-256: 5caac328656095feaf40c581a5b382f479664f42589546a0583adddffd9c928a
font_03_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3