Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf9dedfee9daf8d…

MALICIOUS

PDF

50.2 KB Created: 2020-11-06 23:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: fdbcd86e08220035f99437ff9964c96b SHA-1: 2aec04292be2f6ca52befb2ce98e5c7f01dcc7ae SHA-256: 8cf9dedfee9daf8d26e5b1dea564f011e117b3398d1b8d30180252c56885a491
126 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=4th+grade+journeys+reading+book+pdf PDF link annotation
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/vejobudupemifo-pigijafone-lonigukiwo.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/tarutowivi.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/7991580.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/wujago-ruxakudo.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/fatupuzape.pdfIn PDF document text
    • https://wokesije.weebly.com/uploads/1/3/4/5/134597961/wifiloxavuzat.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/8285579.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://zalepawu.files.wordpress.com/2020/11/science_explorer_astronomy_textbook.pdfIn PDF document text
    • https://guveker.files.wordpress.com/2020/11/pefolelotozidet.pdfIn PDF document text
    • https://zijitirezi.files.wordpress.com/2020/11/tiselegiwulanofivod.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://pedaxuk.files.wordpress.com/2020/11/vobedum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A5 5528 bytes
SHA-256: 9b7d62ec129d3f8c2d9a9e51fc9ddd7f41c4f736817298fa2ce431e2c79eafae
font_01_sfnt_off00008b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7F 10024 bytes
SHA-256: e5ddf2bb0d4e4b5af5329ca44b6a6d001b8f8105133475a2a999a2a10bcbb14d
font_02_sfnt_off0000add1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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