Malicious PDF — malware analysis report

Static analysis result for SHA-256 854085a9963b2780…

MALICIOUS

PDF

66.0 KB Created: 2020-10-04 07:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: bfb48e98fc77f035514545bdff3c2eb7 SHA-1: 4f3dcf603ff244a6b97f90bee2cff80bf04cb1f1 SHA-256: 854085a9963b27801995df99e0b8e8b3522ccb88b08489b71e5d1694a0dee116
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://ggtraff.ru/strik?keyword=criticism+of+behaviorism+theory+pdf In PDF document text
    • http://files.preciousdreamsdoghouse.com/uploads/1/3/2/3/132303010/df0775c27fc.pdfIn PDF document text
    • http://midexu.indianrocks.com/uploads/1/3/1/0/131071041/c08613a8b740e.pdfIn PDF document text
    • http://files.ranvill.com/uploads/1/3/1/0/131069899/vupiridotiseg.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/zawupobedevus.pdfIn PDF document text
    • https://site-1040617.mozfiles.com/files/1040617/xisazazidulub.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/530dba2e-62ab-4a93-9ee6-0efd3bc6f877/85586224199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692c2b63-def8-4fa0-bc6d-9d6f4be008ab/mojezabitonasomuwawajuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6aa677e-6d37-4721-a1eb-e193468ea234/8736180608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e2f1c0-1b44-425e-942c-b1d1a636edd1/66712713449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e67e026-3a4d-4174-aa4c-42a82174c875/53538993580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4661cfed-855f-4734-80ac-d5385f13ca3e/fedisoromonuborokotiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e4d2e2-8f6f-4f27-9320-a72275f6432a/noturasajipowemosev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d023c9d5-97d2-461b-bb5b-e97be06cf209/fonadawovuxogagom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c76119c-67cc-4c5e-88d9-2f49ce1ff3ed/44574640196.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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 5568 bytes
SHA-256: 68c03bb5e28c9e1a83778a2d7c3456bdc6aba3c7bcaeec9551094fee2aeb9f66
font_01_sfnt_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10112 bytes
SHA-256: e36d2eb3bb3789642845807f4685cbf00d942d44386577f20a3de9b9b6a3c86b

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