Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6431b3558086b3…

MALICIOUS

PDF

69.5 KB Created: 2021-02-18 12:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 00dc3f02d7e04885fe1442060377fd4c SHA-1: 3c99909b6f164f2580cf8a68abb3238897cafc3a SHA-256: 4f6431b3558086b39330614add88c84fcb6f85ed970f0e5f28e9faec795c5d32
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/123?utm_term=manual+for+spiritual+warfare+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fcb9c5d0a1d7.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/icEFSxS/who_won_the_golden_boot_award_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486363/normal_5ffe6f3651d74.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/jgD892L/jowepaxononuni.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/jekBZie/juzomakuvopikibi.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/FxueigY/pac_learning_sample_complexity.pdfIn PDF document text
    • https://dibetoxiruvon.weebly.com/uploads/1/3/5/4/135400859/tarisixuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/uwjidTO/70607145557.pdfIn PDF document text
    • https://xuwobonamufaguw.weebly.com/uploads/1/3/5/3/135315698/wifurafodevapol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6027decf52229.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/kokesatodixon/3d_character_model_free_for_maya.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/champagne_colored_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/mutoboga.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/dear_bully_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/client_briefing_document_template.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/67577846271.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/wrist_exercises_for_carpal_tunnel.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/74176493088.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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5132 bytes
SHA-256: a779d3d6cacffcd0fd1cf44cbf40b819524760bd4c9fbd3b5d3fa44342d5437d
font_01_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 11188 bytes
SHA-256: 99cf7c59d4ba89ce5d48ac1a89a2ea638ce2cef5b689a13cbd75cbc56144622a

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