Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e7fb53bd0f0c0e…

MALICIOUS

PDF

54.3 KB Created: 2020-10-08 04:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1f312f63c2f064d267ade1b29698457f SHA-1: e96ba2b29b4feb260fe061e819e811f908c64029 SHA-256: 58e7fb53bd0f0c0e5bb5288972355a1784a28510b9ca34f41339d45f08515d35
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=controlling+a+collision+physics+classroom+answers In PDF document text
    • http://files.kisdesigns.net/uploads/1/3/1/8/131872269/mubewasozasigis.pdfIn PDF document text
    • http://madut.pickenschamberofcommerce.com/uploads/1/3/0/8/130814235/3336691.pdfIn PDF document text
    • http://files.galeriemetropolis.ca/uploads/1/3/0/8/130874316/e812ffb0f6b4.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/5e8acbb2-2115-4775-a2c3-6030d514f24a/bevoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ced8bb-90d7-4f70-94ff-e41ac6e0dd44/94429545840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5b6b69-ecbb-45fe-9291-6a8baa6a767d/soxerufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9010bf-22f6-4ac0-a8f1-63198138b119/64757598759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80b8dbf-598e-42ca-a99b-ae09fea742ef/61593126716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a22ed34-3c58-4892-92d7-db365a160885/2320926020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3550a6-edc0-4f9f-8025-8d6fcd3539e0/13165008885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce3c2fc-bf7f-4516-a64f-5d5df39dc455/tukoximaduguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3a9bbc-d5c5-413d-ac87-fe9155b8860f/wumurasat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37541fc3-23ca-4aa6-b688-bc2a9cf53eb9/33374549545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae51e51-32fd-4c2c-b90e-6761ec926024/dozusimob.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_off0000964f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x964F 5448 bytes
SHA-256: 913ab7660b790f3f10ff0b75c9aa3f53bb98ca520768b468a378429ffd62403f
font_01_sfnt_off0000a8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C0 10440 bytes
SHA-256: 3012eba676da13539a160ebc93c3aeefdfbe859a1e5e828c6f0d09677ea086c4

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