Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cea5fbecadc03fb…

MALICIOUS

PDF

40.9 KB Created: 2020-10-07 23:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ffc36472e43c5165eacefea131290941 SHA-1: c6c915fc5df3b545ade55db6cb6c9b4a0cde4189 SHA-256: 5cea5fbecadc03fb559976bc3ed5f284b8b5283e49918f6b42b28534a0cc2d73
202 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.
  • 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.
  • 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=aluminium+sheet+suppliers+in+qatar In PDF document text
    • https://site-1038451.mozfiles.com/files/1038451/wonomenej.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/rarofafexejenix.pdfIn PDF document text
    • http://files.oakhillsoregon.com/uploads/1/3/1/4/131453384/6b38a19d4eb0d.pdfIn PDF document text
    • http://files.eurosandproductions.com/uploads/1/3/1/4/131437515/7758877.pdfIn PDF document text
    • http://files.translantau.com/uploads/1/3/1/1/131164278/rizul_pozuxo_nazenelesixi_nowivikanujig.pdfIn PDF document text
    • http://files.seanpeinado.com/uploads/1/3/2/7/132711954/veputosenam-jiretax.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/8e048c0d-eb3c-4464-9c26-77aa51da7482/23021865209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b82e234-bcd1-4787-bc47-d54c8454695b/55631793245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12db5967-88cf-46cd-8897-26fbb266b771/delole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013d4910-a28d-45b0-aea7-e8a5ba8ad0c8/47672585434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f2ee94-da8a-493d-9049-f57152605b26/56893580389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759e39bb-2608-41ac-a65d-7ad72b7ecb04/89030365216.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_off00005d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D19 5176 bytes
SHA-256: 318090cbb0f5caba8a382de1cf15653f015a6d957640f68c01e697d2445fe861
font_01_sfnt_off00006e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E89 12372 bytes
SHA-256: e2c8db68421074f8b72bcfc5000ecdab9f904d76519215af47a62e8f84952e1a

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