Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d1f8f91404d707…

MALICIOUS

PDF

43.9 KB Created: 2020-11-09 02:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 4b5e5ca4a4d71f4e0628d7e570f1d481 SHA-1: ea49db78846515d2020aee93de2fb6f0e38a61de SHA-256: b7d1f8f91404d7078f81f72103f228b6bb10309fce9d24335224d4584224b1b1
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=coolidge+high+school+texas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411218/normal_5fa22c38c13de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f89c00a216c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5fa55712938a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f9471f5e3ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_5fa2e05abaa5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_5f8b843cccf14.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/5e4715ce603e87.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/2007146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5f9c6ec912d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f89eedbde0af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_5fa876d9c5103.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/tetazino/network_management_and_administration_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/60837779633.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_off00006bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF1 5076 bytes
SHA-256: d69b40104848978d60bbcf58357d8fc635b975c64723a743e206100c0277ba6e
font_01_sfnt_off00007d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D38 10948 bytes
SHA-256: e83760a476e48b6961bf45cbcf56878a472c4083f500a49054dc1f67f9011867