Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7fdd57cf7fd365…

MALICIOUS

PDF

36.6 KB Created: 2020-11-06 12:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: a395b6913c45a17ca32520a013426c1b SHA-1: 4a3563198b7d22bc2d0393baf5deb6266cf81a5e SHA-256: 4f7fdd57cf7fd3650a072c552d8ecc07f352e40b4d0b4de775c83b275dae2193
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://traffset.ru/aws?keyword=washington+state+emissions+testing+ending PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fa313f70f3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f9d039389aa4.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/0abdb443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f91831befc30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8c48b2c4d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_5f996b6258b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f95c759a99ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f8a9c37a6200.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/c93ce9fbd32c66d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ragejufa/surah_al_kafiroon.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_off0000516d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516D 5124 bytes
SHA-256: 2d23d2896d2afcd2ea18cb8cf62945c1894f92a6d7803b01734001061280cdee
font_01_sfnt_off000062c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 10144 bytes
SHA-256: 8f06422093d45ce4c7f11ab6f1567718be8016f12630ec0523b10e0f0eb0df07