Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b2b5da41ae3292…

MALICIOUS

PDF

38.7 KB Created: 2020-11-09 01:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 39fdf8d8db5a2ea7553730344b05bf0a SHA-1: 19bbb43541dee5228f9ffb010946f62dcc07cd09 SHA-256: f5b2b5da41ae3292e0f1a765be75966ccedafd63ac31226ff7826825fefadf39
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?keyword=the+piano+guys+silent+night+holy+night In PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/7665657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f91210fe0bcd.pdfIn PDF document text
    • https://rujovisaz.weebly.com/uploads/1/3/4/3/134328318/judadilejilekapuviw.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/kunosufumibep-jasapowuda-taxotolagav-kokiwazepuruli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://juzikarew.files.wordpress.com/2020/11/juwabitarerekejupuwarutij.pdfIn PDF document text
    • https://vukurewaf.files.wordpress.com/2020/11/majuvitazo.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/povenowitifebazoduvi.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/rokamowusasexumafimiw.pdfIn PDF document text
    • https://zosapakut.files.wordpress.com/2020/11/xorig.pdfIn PDF document text
    • https://gozodusi.files.wordpress.com/2020/11/pipasogasepepudutamigopob.pdfIn PDF document text
    • https://kinoxef.files.wordpress.com/2020/11/encuadernadora_de_libros_manual.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_off000056e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56E7 5036 bytes
SHA-256: 399d3117ce8249c47df3d39a2695d685e10820ab1adfac8b467230dc45cda493
font_01_sfnt_off00006812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6812 10932 bytes
SHA-256: b737f8d99513be1ec339d253e91ed5733f9b935b818d99153d3b8e95ecf47b5f