Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec1c23963948045…

MALICIOUS

PDF

80.1 KB Created: 2021-03-12 17:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68fa2906faf1d101ddd705554b36a521 SHA-1: b11c0dd214519ce83ace4b057f0ad14ba72128dd SHA-256: 4ec1c2396394804590248c3a28f75f24e4995be807b2581b4d5cdd539e229405
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a legitimate search result for educational material, likely to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the presence of an external URI points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=princeton+review+gre+math+workbook+pdf
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5fdeb9635556d.pdf
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fc8e1e381fe7.pdf
    • https://cdn.sqhk.co/movozuba/MbjfQxU/sirozigoruv.pdf
    • http://pasipodo.mypressonline.com/harry_potter_free_movies_streaming.pdf
    • http://com-signto5.xyz/an_account_of_an_experience_with_discriminationrqqwz.pdf
    • http://lotsmen.com/bodmas_worksheets_for_grade_47sasq.pdf
    • https://cdn.sqhk.co/tikugosedik/Zjihduw/winepitigizuwapuvuboso.pdf
    • http://folugomobok.getenjoyment.net/spirit_blossom_yasuo_animated_wallpaper.pdf
    • http://podarokinsta.online/73737484184udncd.pdf
    • http://tuduvodakep.mypressonline.com/tuzar.pdf
    • http://dsv-trening.ru/13414158173upiy6.pdf
    • https://cdn.sqhk.co/lubigegek/rbjjbm1/pre_modern_world_history_definition.pdf
    • http://reflectionss.space/performance_fee_calculation_methodologyqrajv.pdf
    • http://jaxagogilexet.sportsontheweb.net/philips_respironics_simplygo_mini_portable_oxygen_concentrator_price.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_009282805e7a4f3d96c8688ef265ca7d.pdf?index=true
    • https://s3.amazonaws.com/wibedubosateg/kolobipakaxetano.pdf
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_80de7614672343ce9838bdd03550d5f9.pdf?index=true
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_1452ae5f60fc4a9593bda34b5df461c4.pdf?index=true
    • https://s3.amazonaws.com/susonanezaj/pennywise_true_form_book_description.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd7.bin
bd420fc39c14998a7cb1d66eacedcc39f10635322f74ea226bab54f5ec3c9f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 5716 bytes
font_01_sfnt_off00010f32.bin
947b0fde7b6049c9537e21a12afb3d3810c0330f8a7038e53bc206c37f636d3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 10608 bytes