Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2733a4352e63171…

MALICIOUS

PDF

67.0 KB Created: 2021-02-15 02:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 506b2c571d050506c209c9a59617cea7 SHA-1: 52039e05d07d96e5f4feb03275eea2eac645b0da SHA-256: c2733a4352e63171c5e8bf4c7df31af606ddfb8a3f1cb853265d731411cefc1b
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=dibujo+del+ciclo+de+vida+de+la+mariquita In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fcb4df524a0d.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/9zjbn6Z/fun_101_okey_hediye_kodu_2020.pdfIn PDF document text
    • http://gratoraama.space/79870652163g45dj.pdfIn PDF document text
    • https://semomekavo.weebly.com/uploads/1/3/4/3/134373715/juzinipenesul.pdfIn PDF document text
    • http://fabulouss.space/fexufaqrjsl.pdfIn PDF document text
    • http://znohist.site/dota_underlords_guide_combodx7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_5fd9d7135efeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/Sibwyij/99141805530.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/lovarokowkcos8.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/ejdxjjf/4313803335.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/lomogas/tosop.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/13674569596.pdfIn PDF document text
    • http://bejegexojadivaj.epizy.com/placement_report_iit_bombay.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/77342598786.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/krabi_tour_guide_package.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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 5308 bytes
SHA-256: 4a6d540779b093d29b88d31427f120924cdf7f1966efab042effacf2bf3b7d00
font_01_sfnt_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 10864 bytes
SHA-256: ef2ad3e7fedbf5367a940263fa03df62c058eb57e50c42db897d73a8d793436c