Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21d35571ff033e9…

MALICIOUS

PDF

43.0 KB Created: 2020-10-01 06:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b7e512f6d20580a0f9883a1667f41458 SHA-1: e2d930e9aac15fc31db5584afe0757656fa35444 SHA-256: b21d35571ff033e9c1c7252c1226ebe7ce500323f46a8a9ab01f47cadb87e7f3
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/strik?keyword=principales+centrales+hidroelectricas+del+peru+pdf In PDF document text
    • https://site-1037009.mozfiles.com/files/1037009/37028412424.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/risivedopesogulita.pdfIn PDF document text
    • https://site-1039888.mozfiles.com/files/1039888/60178305738.pdfIn PDF document text
    • http://dexip.mutedwoo.com/uploads/1/3/2/6/132680813/gotiveju.pdfIn PDF document text
    • http://jikon.behinddallas.com/uploads/1/3/2/3/132303301/benekubizi-wuderixuvut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9009/1940/files/soda_license_key_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/kesufuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/36538809990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/ones_tens_hundreds_thousands_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/week_of_year.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/3323/9192/files/connectors_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/nenumapefiramodapasovawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/37490842200.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_off000067ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CA 5244 bytes
SHA-256: d18f039fdf23dc0efe5c63a90826519265a9e03caf3f79670f53b713823d3ac5
font_01_sfnt_off00007995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 10876 bytes
SHA-256: f9b91bfe7a969c5b46172face456c54c7b6f5dbccc6227f3d88af8b08337cc98