Malicious PDF — malware analysis report

Static analysis result for SHA-256 491a750a9ae3aab4…

MALICIOUS

PDF

86.8 KB Created: 2021-03-16 23:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41de0f9f3c23220749f55e9c9804a8a4 SHA-1: 62175a6142e9f5d0e7b78a45b3faf806976b6c5a SHA-256: 491a750a9ae3aab41387e94b086b5cd0fe094d840d8cac146bb31555830cd7f8
96 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to database characteristics, directing users to external resources. No scripts were extracted, but the presence of multiple external URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=caracteristicas+de+una+base+de+datos+en+informatica
    • https://cdn.sqhk.co/fekawitaxug/ohfN8hh/5692278610.pdf
    • https://cdn.sqhk.co/tiluzegata/hb6UHgi/77820175794.pdf
    • https://cdn.sqhk.co/desixurate/ijbaE6d/cult_of_war_mod.pdf
    • https://cdn.sqhk.co/gutifusuf/8VhiHdI/kigezevobimejawigira.pdf
    • https://cdn-cms.f-static.net/uploads/4406820/normal_6014ff4fb4b78.pdf
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fd2a52627afb.pdf
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffe48f544bf9.pdf
    • https://cdn-cms.f-static.net/uploads/4476273/normal_600a4eb94f8cf.pdf
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5feebecd60e46.pdf
    • https://cdn.sqhk.co/kitujesijak/ibgcegi/70097888848.pdf
    • https://cdn.sqhk.co/webuzifinuno/fBAjdzD/nfl_schedule_week_13_2020.pdf
    • http://megopoveguvujal.medianewsonline.com/wifatones.pdf
    • https://cdn.sqhk.co/jepipovi/VO8jbZs/82049088947.pdf
    • http://gelupulofevabek.medianewsonline.com/baixar_passei_direto_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4379370/normal_5fc79e1ac1921.pdf
    • https://cdn-cms.f-static.net/uploads/4481170/normal_60392a4d2b522.pdf
    • https://cdn.sqhk.co/monazaxumol/iiiiigi/royal_princess_running_game_jungle_runes_s8.pdf
    • http://dorulezebum.sportsontheweb.net/nail_salon_open_today_sunday_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fipegaz.epizy.com/google_play_for_windows.pdf
    • http://gakamaxoluzes.atwebpages.com/55395221906.pdf
    • http://nifusotajezunur.atwebpages.com/o_alienista_resumo.pdf
    • http://fojofediwesifog.rf.gd/flysky_gt3c_specs.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ed.bin
0e8357da3b102a64e77dcbc5c30e22de9f1078a754b4173749444e8e195a19df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 5180 bytes
font_01_sfnt_off0001126c.bin
0426efff683ec3230a1971278d0cab14ec334599801aead5156b20d49bde4057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 10724 bytes
font_02_sfnt_off000135ed.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 16204 bytes

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