Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb790df58510f60a…

MALICIOUS

PDF

48.2 KB Created: 2020-11-08 05:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 2a86c7b66f8a4a1bc652f05cc378be02 SHA-1: 4418713b7f821a20217579853bc2836f56e8fa4c SHA-256: eb790df58510f60a87def24f7ad469494626d0d0f9c1c6a4b10675ccd8aa9b92
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://traffking.ru/123?keyword=kidde+smoke+and+carbon+monoxide+alarm+maunal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f8e94e713d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5f8d0ee243343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5f8ff4ac0f41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f90df4ac2bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5fa750b9ee516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b03f06-4bc3-4f48-9435-c564886ecbd2/dorufukebogadotimixuwe.pdfIn PDF document text
    • https://delogifelet.files.wordpress.com/2020/11/basic_algebra_practice_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/99374576427.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/nugiwirelagupalufuj.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/fowesunode.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/vonagibatuzovof.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/webroot_spyware_sweeper.pdfIn PDF document text
    • https://bumukixux.files.wordpress.com/2020/11/54013985241.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_off00007ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCC 5328 bytes
SHA-256: 55f7ceef3ea67290da4942e74da3d3bf988116c81e4fcfa47828aa26d3a051fd
font_01_sfnt_off00008ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 10764 bytes
SHA-256: e25783387e1bb447b4b0d8e5e929c27966deb6e429867ef081ca8bf3d19d42fb