Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c3d754e52eeb8c…

MALICIOUS

PDF

42.7 KB Created: 2020-11-06 17:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 4569f0515bbf4baade30259631983696 SHA-1: 087a480dd626494b7e6475e86079aaf90a8a9509 SHA-256: 80c3d754e52eeb8c1f9d7aeb927039260db30ca7c75f08957ff57c736d2d8701
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=stop+and+shop+a%252B+school+rewards+program PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5f9a053069b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f9767e96ded5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f920c6d7505c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_5f96fa798a6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8704565841d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f98842e2a347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f8ef3099acd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5f98d4767cd72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fa39c5baf3b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wirotuxesu.files.wordpress.com/2020/11/8965639901.pdfIn PDF document text
    • https://katimovu.files.wordpress.com/2020/11/99671498994.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/66301710817.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/18106768169.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_off000065e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5680 bytes
SHA-256: ad5e297e3b8bc9436936f2c1c45d8dc148890e1baa3f612f4952aa87720651d8
font_01_sfnt_off00007929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7929 10696 bytes
SHA-256: afbfcc785ddb6ecb3f7395f1178d07421709d5ab99361ba8a7688fdb8c474339