Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba5bd2b640c75cc…

MALICIOUS

PDF

38.0 KB Created: 2020-10-31 12:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 71a7f7e229043ac8c7cd5d9b71cda315 SHA-1: 5bdfcb5e61aad9b8e8dee95ae6c2e21071b23e5d SHA-256: 0ba5bd2b640c75cc60c2d4607ee06caadd12f5aa8680bd2dd20971637801875b
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=myspanishlab+sam+answer+key+chapter+4 In PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/xuzofemakibodan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5f9cc306eba38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8f1def750f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5f9cead074d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f97ae35f3c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5f954252aed47.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005454.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005454.bin)
    • https://s3.amazonaws.com/nawuvud/68178053103.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/farm_city_poster_contest_keep_alabama_growing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6812/7893/files/diderot_supplement_to_the_voyage_of_bougainville.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/36126862776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17344b61-4af9-4203-8017-84018f645bac/kopag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d340ac9c-c9fe-4a16-acba-d250240d7e02/vuforokagim.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/nusovakafowidi.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_off00005454.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5454 5664 bytes
SHA-256: 4d0f9fe1ddae2fe3d9a8cde809029992c747b98dc893036b3d0c8c04f9ad35b8
font_01_sfnt_off00006795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6795 10728 bytes
SHA-256: 490c1e3cf95fac7ff43ab12034ac7437c3feb7e73fbaf2d7d841d1161b6cc956