Malicious PDF — malware analysis report

Static analysis result for SHA-256 49085c9668e5e6ce…

MALICIOUS

PDF

49.9 KB Created: 2020-11-06 03:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b60f441b86ae75ff82a40c3d6add946c SHA-1: c1117ee8b12f1a2db04519d9bdaa64900d233dca SHA-256: 49085c9668e5e6ce5440582760af5ead0e64f9e5b0108861c321af8eae55f5dd
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://traffnew.ru/aws?keyword=cognitive+apprenticeship+approach PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f871be4b493f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5f9584726586c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fa39a168714e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8a2bd887e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f96422ee3381.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/demoxijifiw.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/9062d997-301c-4a55-ab6e-d1f614bdcc31/xirubetom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3e1038-a406-43fb-baaa-016d724e4511/88906436585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff8db6d-6ab4-45d0-b796-a88901f04a76/54940152699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698822d5-82cf-4ff1-89a2-d9644efc097b/tudesepogejutareruxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba898da1-071f-4990-97d0-a85611ef8bdf/rezod.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_off000084c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 5128 bytes
SHA-256: 2f542a9d4a72b2e371494f69a1c4efbed58c0b1d2216aa6a1b63a2ca57590efc
font_01_sfnt_off00009639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9639 10900 bytes
SHA-256: c1bcd201bcadd02af0a3c581f0d63398d96d89d4c7ae13b3c1c8e311a58c2b6b