Malicious PDF — malware analysis report

Static analysis result for SHA-256 25091b0098448e82…

MALICIOUS

PDF

42.0 KB Created: 2020-10-28 06:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c1d8690ba4d6dc6bbb28ec2a5de12c48 SHA-1: f6c3b90fe347bf755533f9ff6fecf6533c3f9a86 SHA-256: 25091b0098448e8217c68e2b1d1ab52253dd0f30cd3c4e63b310816d6dfae99f
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/pify?keyword=sketchup+software+download+for+pc In PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4169262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f98905de6803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f98e85635e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8b4f048d715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f966050b6922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5f8c45f5440d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006591.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006591.bin)
    • https://uploads.strikinglycdn.com/files/af969d46-befe-4ca0-bebd-69c1ccce30f6/larousse_gastronomique_en_espaC3B1ol_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9260f03b-922f-4475-ab1b-b863a0244a18/98516315682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84eb8288-1164-49db-934e-6ded60df9111/war_against_all_puerto_rican_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c738cf90-507a-4e21-8269-727d3652cd36/zozosusikabazarewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860b7477-5a9f-44d5-81f4-7180abef9b4a/17437771542.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/canadian_visa_application_form_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/73251824199.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/history_of_aerial_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/blockbuster_historia.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/tuxufimujerugejikofido.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/xudovilidu.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/54993021463.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 extracted file (font_00_sfnt_off00006591.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6591 5500 bytes
SHA-256: a21ba7f002c723bd1261e60b4b6f5b709fc4c6e2687a9426028746086a002f5d
font_01_sfnt_off00007854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7854 10108 bytes
SHA-256: bf4a8b9062beee2a71988e66ca5271124f22c33e800f72f4616fefd91e38fa8e