Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db1a56aa5f105d8…

MALICIOUS

PDF

71.7 KB Created: 2021-02-27 06:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 86d3884f0b7579fb02475f3017b9a625 SHA-1: 799441c93eb9dccc7c1b1984b94340c944cbb791 SHA-256: 1db1a56aa5f105d88267b62bdac249adebbe5364409a1878a7ff156b398874ce
236 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/award?keyword=how+to+connect+an+onn+wireless+mouse PDF link annotation
    • https://cdn.sqhk.co/pajerelo/Qhchh8k/gibudanidif.pdfIn PDF document text
    • https://ludikunoxor.weebly.com/uploads/1/3/5/3/135345671/6f0a361e.pdfIn PDF document text
    • http://bloomwithdeanna.com/49195582922vgtzn.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/ajjRhcK/wuvuvebewodefexekurufit.pdfIn PDF document text
    • http://begetus11ppz.xyz/77772241832mpjf3.pdfIn PDF document text
    • http://axacheat4.xyz/ancient_greece_olympic_games_lesson_planso7zhb.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/3885527.pdfIn PDF document text
    • http://axecheat8.xyz/21536373714a45yb.pdfIn PDF document text
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/5341efd29a8c3a2.pdfIn PDF document text
    • http://djami.ru/42243669383hjl4f.pdfIn PDF document text
    • http://confirmationhelpcenter.com/how_much_does_a_retractable_awning_cost_ukrpcb5.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/vikukinumet/73698445434.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/comienzan_las_reformas_borbonicas_en_nueva_espaa.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/91072844070.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/duguvebanasiwasabumi.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/90949756430.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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 4996 bytes
SHA-256: 4c04bd31d157ab4da8049119c2e1f4a723ad75d21df49e033edc300d80a69492
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10476 bytes
SHA-256: 2a856df8786919b16a8e17bb65d3d986483835d764c625e59379c4e38f71b408

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