Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b1a81d99644bf…

MALICIOUS

PDF

81.6 KB Created: 2021-03-23 18:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7407fd7ed68f9b539852b34604b37dc SHA-1: b8ef243c4c12581e829b26dfcdd833a8e8c88d0a SHA-256: 8d5b1a81d99644bf50c3485f424c89800485b3add0d592ee9416d877ab02d49f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a site disguised as a definition, likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI heuristic suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/award?keyword=computer+mediated+communication+definition+pdf
    • http://puvinizozibejir.mygamesonline.org/rode_videomic_pro_iphone.pdf
    • http://goladelexugezi.sportsontheweb.net/the_queen_s_gambit_book.pdf
    • http://zukoretevir.medianewsonline.com/buona_beef_nutrition.pdf
    • http://dekoratifazanu.22web.org/962266876.pdf
    • http://dugarudewemudo.sportsontheweb.net/dujakosisevi.pdf
    • http://norikaloro.mywebcommunity.org/pawupejexim.pdf
    • http://liwitesuzemumex.sportsontheweb.net/riesgo_y_rendimiento_financiero.pdf
    • http://zisezamerares.mygamesonline.org/salinakopiwas.pdf
    • http://mojenisijita.mywebcommunity.org/temetobodoxiwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tesoxukezeziles.epizy.com/ladugobefomewuwabisi.pdf
    • http://xeravujowa.epizy.com/tagalog_logic_questions_with_answers.pdf
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_4c3f44c696aa407dadd1acaf89ec74e5.pdf?index=true
    • http://vexolofifete.atwebpages.com/bepekowogizinijuvodelinoz.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_dc1270163b444e6796c8aa18f798e986.pdf?index=true
    • http://mowadavukusut.epizy.com/lepomotinirojikaf.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_e03fa80a7ff04f38aefcfcb52f41bff4.pdf?index=true
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_42fff898ed39456bb0579a12f6ff877a.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_7475837d8ba7441084805327641eeb76.pdf?index=true
    • http://perotufusutukes.epizy.com/sun_joe_pressure_washer_black_friday_deal.pdf
    • http://daponub.epizy.com/rang_de_basanti_video_songs_mp4.pdf
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_dec0edeb87c0494589f4076632a64dfc.pdf?index=true
    • http://wimanusor.epizy.com/pabosezoxiponuzitojeloma.pdf
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_9d6633e7610b46b599409424862461c3.pdf?index=true
    • 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_off00010060.bin
d0c98728e1b89f20b20844f7b937e4bc11a099af541d0b073e3cfbc3883449be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 4996 bytes
font_01_sfnt_off00011145.bin
8545226801f0e0fe33100615d7d50afcb5b2f2e08a7f16691c26d46207403cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 11488 bytes

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