Malicious PDF — malware analysis report

Static analysis result for SHA-256 4636d1322f4377e5…

MALICIOUS

PDF

48.1 KB Created: 2020-09-30 10:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cbb2021655be51f9b13f70453da524a3 SHA-1: 2abb3cbda46dd3885beffc0d5064e8a4e4e8eb30 SHA-256: 4636d1322f4377e5a071863cc6a6956c30253304ea769425cce6d724b327446d
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=apostila+aula+de+viol%25C3%25A3o+iniciante+pdf In PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/24992322288.pdfIn PDF document text
    • https://site-1036898.mozfiles.com/files/1036898/vuzuxixepefesobiwu.pdfIn PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/jodamidetibemigelaxepi.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/57516670078.pdfIn PDF document text
    • http://files.transportation.jvcai.org/uploads/1/3/1/6/131636990/pavawis.pdfIn PDF document text
    • http://rojaxuja.hannahleatherbury.com/uploads/1/3/1/3/131380429/sufaw_lefabosawufige_pigajim.pdfIn PDF document text
    • http://files.jaylethbridgephotography.co.uk/uploads/1/3/1/0/131070216/gudazuzezoxulif.pdfIn PDF document text
    • http://files.indacreations.com/uploads/1/3/1/3/131383651/kowomuk-borodimatiw-vunavusozu-pipupokati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdfce26-3841-4716-ac9b-59f1b0cbb854/xuvaguxokozewuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbac5b5-0177-4289-967b-c7450a996101/66065112650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53f6459-fc84-4e60-aba3-155b58aff13a/kovekirubabawijima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b34930-336c-4abe-a6fc-a02e59849d83/bopilivowenobibatotan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7906b264-e8ed-4035-a0de-853391c51532/35029803976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1ce01b-cfdc-4670-930d-597dd0bf6edb/74953129997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d63659-4683-488a-95e6-04e1ba60959f/55719681008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8950b0ac-332d-4a83-b1c0-065dcd2eb1a8/fazefunimarazamosimip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 5420 bytes
SHA-256: 9c5059acf2f1bfc52e9d65e62d542cb418cc45c56db39a4870921ce967511ab1
font_01_sfnt_off0000757d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x757D 12072 bytes
SHA-256: a2244eb3f09d12605f2aa8f5e32f47f5035dc6ead4c5fad24c355579648e9479
font_02_sfnt_off00009b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2A 16304 bytes
SHA-256: 334a632046566dba1e13aa2ad28522ffc4701ff005b1d667d8ded0e84145bcf3

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