Malicious PDF — malware analysis report

Static analysis result for SHA-256 617591b7f49c6787…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 18:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3762a859e90588c0afc0d828b014a52b SHA-1: 945f75d28107c11eb4b4b95f3b58eb91571e9628 SHA-256: 617591b7f49c6787e4eb612d5b776c3094809c7e478071abc17482c813d28637
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs, several of which point to potentially malicious domains. The PDF structure and embedded URIs suggest an attempt to redirect users to external sites, possibly for credential harvesting or further malware delivery.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=propiedades+y+beneficios+del+aloe+vera+pdf PDF link annotation
    • http://wolifote.getenjoyment.net/85960238739.pdfIn PDF document text
    • http://keepqifi.space/baby_names_inspired_by_book_charactersfhznr.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/casebook_law.pdfIn PDF document text
    • http://afracheat7.xyz/saxon_course_2gmw4w.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/83938083241.pdfIn PDF document text
    • http://austritkfa.com/calibre_for_windows_7_32_bit34m12.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/hgcxjfi/slot_car_track_builders_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/ic7hgLv/fruit_ninja_fight_apkpure.pdfIn PDF document text
    • http://detonic-buy.website/book_of_shadows_5e3qnnd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_54abc2a33ab5454c99511c919b4e5d59.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_f1149b95464d42bdb7f2d5d49a96cf1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/somezar.pdfIn PDF document text
    • http://sadozejeko.myartsonline.com/butterfly_effect_theory.pdfIn PDF document text
    • http://mafulapovura.epizy.com/automotive_technology_book_download.pdfIn PDF document text
    • http://rokafexoxo.epizy.com/figabebeguderefije.pdfIn PDF document text
    • http://dalatizofudow.rf.gd/ceidg_1_formularz.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/video_converter_android_apk_uptodown.pdfIn PDF document text
    • http://joxisuzu.rf.gd/formal_analytical_thinking_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/badomagajarule.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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 5452 bytes
SHA-256: e1d77424ed6a24fc0dae53b5187b7976f70c33a5bd25772eb586e2ad04698907
font_01_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 12200 bytes
SHA-256: 6da7998b716de679fe525375e0a76080add7ab7ffb514cb765c2529bd8f5a8c2

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