Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75494d45821e607…

MALICIOUS

PDF

42.4 KB Created: 2020-11-09 13:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 773382d39132fbc9a2505d883f9363a6 SHA-1: cfe5eb06ba5fb18138d0eef7c8f3ff772064c152 SHA-256: b75494d45821e6077026e9a26e5481fcd084805c3d96650c479d41f5a09c688f
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://trafffi.ru/123?keyword=behavioral+adaptations+of+cheetah PDF link annotation
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/savoke-kuvozo-vorugiramobi-vizezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f9ebf4fd0e63.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/sesulakunilejosanafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fa326c9c81bd.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/kovilowab/wukowesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fba560b-8935-414c-a401-2133e8611e79/73998778905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73ddcfc-4546-4ea3-ac1b-962560221f16/nubunar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c726b9-0dfb-42a3-833b-f80a7fd46a59/33513418779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f3941b-d77c-44d0-aa02-c7b68f263dc7/98375555896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcba127-7374-4ac9-88f8-1aa5925f5937/knex_screamin_serpent_roller_coaster.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/dutavepiwezido.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/sokokupesasum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4918c676-ec60-4edd-9841-f97668e5317d/70044564729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a78b4b9-0342-441a-a222-f4d0effc1c94/dagadipiwefaradidufazugij.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_off0000677c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677C 5352 bytes
SHA-256: d1b3fa79aa35c11a4401dfa1c9916a77095524570307a3f0cb01d587c7461c21
font_01_sfnt_off000079b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B4 10368 bytes
SHA-256: 8497a09fc3a4f924d5e8ef3e1d070534a8085800fa2019e85fb9663070b338e0