Malicious PDF — malware analysis report

Static analysis result for SHA-256 0546727b214ac979…

MALICIOUS

PDF

51.6 KB Created: 2020-11-08 11:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9b6219f8d8b0f1646de54b0d3f904da7 SHA-1: c633e1558a517d789c2db11837c7b8854640ebbb SHA-256: 0546727b214ac9796c53519a8a91e24f63d504bdb2c6bf1f3cfb456bec7c3d48
194 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.
  • 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.
  • 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/aws?keyword=russian+holidays+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5f8e84ab4a53f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotizifime/13007935657.pdfIn PDF document text
    • https://xixojis.files.wordpress.com/2020/11/vidui_prayer.pdfIn PDF document text
    • https://kilenija.files.wordpress.com/2020/11/zunutikerujaz.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/gabizagamumarokidatanum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b48da29-a380-4a2f-b454-e0f5280ee7d7/26764649117.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/tafusumopufopufavog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c29c593-9abe-4a23-9f1c-793dd1dc594c/proceso_de_la_planeacion_educativa.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/rogiz.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/insect_population_ecology.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_off000083de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DE 5448 bytes
SHA-256: a968d5cb3d2ae901c524c35ef98efe533b65be6bd8f52f766aa957ea6b7c7289
font_01_sfnt_off0000966a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966A 14100 bytes
SHA-256: d512ce82471b1d04ddcb91a9a206549f66c5727e019e32d03896a4f573a037f0