Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00439d74fa04a5e…

MALICIOUS

PDF

70.9 KB Created: 2021-02-10 13:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 22e6d6ce175936889778e4cf4d28bebc SHA-1: 05e474734d639feada8f7a72c075d151630a2964 SHA-256: f00439d74fa04a5e699f7b40c859f0af8635529adeb3390417b57401bee5687d
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/wb?keyword=multiplying%20negative%20numbers%20worksheet%20with%20answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379987/normal_6004af47c8010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_601c601a5a088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_602143ffb2ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409246/normal_6004d3e674596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_600ef2b128f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fd1644657940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5ff9c0ec32fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_60144394883c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fca7478b7588.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/0247d1ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fcbb1ddd817f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5ff7be2e3f150.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/g1ckUid/didion_orf_hours.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/teximikamukubo/jumusuriko.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/multiplicative_comparison_worksheets_grade_4.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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5696 bytes
SHA-256: c01c8671a2649669af13bbdcd14d32542c2de03fd47a8eb71f58f6268401c314
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10184 bytes
SHA-256: 7091a5a13977a0ed9a07728a81f9c7fa685c4d596d4204c3b2406a0272d5d8ec

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