Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f21a9fd90db55ec…

MALICIOUS

PDF

82.5 KB Created: 2021-02-13 14:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: b92533c88eff896baf94b3ab53a9d94c SHA-1: 6fc51093fe8a4327695a8e59b8604a823d4e32dc SHA-256: 4f21a9fd90db55ec8d7a32f072edb7e0038fe04b6b1debed2865fa05102fde9f
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=profusion+infrared+heater+manual In PDF document text
    • http://bigops.fun/android_studio_update_version_numbertvjn7.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hjasxhj/75426534615.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/hhAicib/football_coach_shirt_controversy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5feccd48dbfb3.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/KgirPhd/wuzomoxewepele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_601d5db81f4e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/ighSC8T/nivipawipeged.pdfIn PDF document text
    • http://instofficial.online/slot_car_track_buildersl91qz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fde4e14e0267.pdfIn PDF document text
    • http://triple-doska1.club/52166672022igd4a.pdfIn PDF document text
    • http://veronaital.space/pronunciacion_verbos_irregulares_en_inglesdhqt7.pdfIn PDF document text
    • http://usejus.pro/duwugekiparexiwokafizanjw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_6024a9d5dd75b.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/zarelusipofox/mebukoji.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/black_panther_trailer_2_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/ajaran_syiah.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/ponuwajonulowogotafopa.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/bafg_anlage_2_zum_formblatt_1.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_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 5148 bytes
SHA-256: 500f3ebd677f0f815e18cd55c113d5d53d700d1916efb4cc91e6a255872c64d0
font_01_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 14132 bytes
SHA-256: cc3b3b2f0f35d6b44896f1b9dafca3fe30a46d9315732a9f10d87ff57bf37182

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