Malicious PDF — malware analysis report

Static analysis result for SHA-256 762db9d2147bc042…

MALICIOUS

PDF

78.5 KB Created: 2021-03-07 07:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3683913ca0e68cc88ee131920b573c65 SHA-1: ae82706f5c2746424fa3ea91608239438a2781c7 SHA-256: 762db9d2147bc04242ce1707295c5c46775868d58606ec3ef189be304dff98bf
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/strik?utm_term=nato+charter+article+5', which is likely a lure to a phishing site or a download server. The document body, though heavily obfuscated, suggests a theme related to the NATO charter, reinforcing the phishing pretext. No scripts were extracted, but the presence of malicious URLs and the strong heuristic detections indicate a phishing or malware distribution 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/strik?utm_term=nato+charter+article+5 PDF link annotation
    • https://cdn.sqhk.co/difanemifal/dgicvwY/mewuwusugofojixovez.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/2q6Rig2/sieve_element_definition_biology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443595/normal_6006e24ebdec9.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/los_juegos_del_hambre_sinsajo_parte_2_pelicula_completa_en_espaol_latino_repelis.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/jdl6sha/pic_quiz_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/nhen6ji/just_build_battle_royale.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/VChjfif/puzadezigolajugixatowuxax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_601a450e1c812.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/97783422924.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/gfgcggH/friday_13th_killer_puzzle_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/Ujfjejg/live_stream_tv_apk_cracked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483336/normal_5fcdaf60bf112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/53827976554.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/aphis_7001_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/59892357149.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/8075509327.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/kipifuduvadibefevugijez.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_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 4804 bytes
SHA-256: 821ba04cfbd8663622c77d54a353f6da34d810f2d956c2f13bd47825367b8610
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 11488 bytes
SHA-256: 4aa7837fa1f59d2ae5c73bd09bac8b7cda32c25ff55936d1cedd2abbf828318a

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