Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98dcc37b65968db…

MALICIOUS

PDF

47.9 KB Created: 2020-11-08 03:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2c8f47c223dc32237b26ff61bcb2d549 SHA-1: 271aa2d6ac336bae3af001e905eab389820369a9 SHA-256: c98dcc37b65968db9f9d2de9871def4adf207774adc9d30d862c4db6f1fc5965
176 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?keyword=campbell+biology+in+focus+2nd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fa3e2d54ce27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f938c79c0403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_5f8f5f5b1e31f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_5f9b548ccf715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8a2351d01ec.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/nupotukig/aluminium_partition_construction_details.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/lobakebagelumukomejaxasil.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/97355677695.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/saradomin_gwd_guide_osrs.pdfIn PDF document text
    • https://wukifopagoso.files.wordpress.com/2020/11/filme_el_metodo_dublado.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/cowlitz_county_parcel_search.pdfIn PDF document text
    • https://ruvalagevibi.files.wordpress.com/2020/11/malikizuduf.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_off00007716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7716 5656 bytes
SHA-256: 7062b6376f15601ebc1fa5153f6278aba505d32ef7c5332284b80ab9405ea3ba
font_01_sfnt_off00008a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A53 12004 bytes
SHA-256: 77ae278f630dcf3392b923daecd00d307770a4c72c685882b565e19a3a96fe9e