Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913176dae91bdc5…

MALICIOUS

PDF

50.0 KB Created: 2020-11-09 03:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: bbf01051e748278f507c47ca7059c32c SHA-1: f7ae76aa34ce4883604c7a6f75ea050c350d72db SHA-256: c913176dae91bdc51fb82d8bf390a53fa288ff44bde1fe328eef869603f6e531
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=virtual+graphing+calculator+download PDF link annotation
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/zimetiw-xipaveruxo-gogivimu-dewud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5f9cae1f8263b.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/nenikiwori_munuxebonugoz.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/d863d9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/685f831f-e126-4d2a-b104-1c2eb8abc40b/9514318004.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/electronics_handbook_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7707e822-76df-43d6-9adf-8333af417553/74117078414.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/antrenmanlarla_matematik_2_zmleri_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d5d08c-33ae-466d-bfe1-d4ee1f3b4eb2/poxevuwub.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/hype_cycle_for_artificial_intelligence_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15414d54-77b0-4196-af42-3bd6c5700656/8842535759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ceb2fd8-2daa-4de1-a7c0-effe47dcd083/mopolemurutikixug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca686a4-08c4-4b29-8e5f-afdea48b0a38/94713445384.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 4976 bytes
SHA-256: 9071ccd9b53b0ddd64746ed8379b5723065556fd9a96085fe20cff2ead9e8c5c
font_01_sfnt_off00006ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF7 11832 bytes
SHA-256: 143414d890dcd3f5e98b78469c54c4c55d57cf2efbbed1986e2a0d1a202a2d71
font_02_sfnt_off000096f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F8 16228 bytes
SHA-256: 672bf7f552439350afd8ae360022c37390def6c1c179b5aa420eeaeb19a564e0
font_03_sfnt_off0000ac63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC63 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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