Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd351b91573b285f…

MALICIOUS

PDF

60.1 KB Created: 2020-11-09 14:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: a5c90d56263e4a7c5071cad0e7f6a540 SHA-1: 0e29565a873b2fdf6bad89b6f95f2043f4befadd SHA-256: cd351b91573b285fb356a198a1a7945b5b992e01ebaa52d18c543d04b411ed63
144 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.
  • 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
  • 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://trafffi.ru/123?keyword=tile+council+of+north+america+handbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5f96de9816b43.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/771577.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/827747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5fa1eb7324049.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/lerama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f99336735eda.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/408124.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/461cfb9705817.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/kikunojulejuj/hpi_savage_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/77060260198.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/the_certified_reliability_engineer_handbook_third_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AA 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off0000aca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA5 5368 bytes
SHA-256: 933ed774669309bb7a02ec9520642d5b1aaf01cb1580f98f55d326d9d96f3ca7
font_02_sfnt_off0000beb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 10096 bytes
SHA-256: 7013cf4d1a9bacb8bd9f8daa7f4e07bb377783ac989c206961fe4bc7025e54b6