Malicious PDF — malware analysis report

Static analysis result for SHA-256 be23ef935da170ae…

MALICIOUS

PDF

88.4 KB Created: 2021-03-14 17:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8062dcd8cb2eab20f186d9071303eb22 SHA-1: 0e35b31325b25241fee86da4b2779a425763ba69 SHA-256: be23ef935da170aeb02ce9ee6a9eef8fc9086a558411e80ab47fffb9afbb015b
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL, which is a common lure for phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://seumenha.ru/wix?keyword=about+musical+theatre+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/bulixanejad/yc7geCF/how_to_learn_c_fast_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/fhgfWha/doctors_care_sunset_blvd_west_columbia_sc.pdfIn PDF document text
    • http://hamlikjorettoop.ru/saxon_math_course_2_worksheetsm2zrh.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/fmialie/escape_the_bomb_unblocked.pdfIn PDF document text
    • http://giocodigital.website/kidz_bop_concert_2018ge9n8.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/hdhO1ii/floor_mirrors_for_sale_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/ihjcXge/tripp_trapp_newborn_seat_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/3sdhiqD/analisis_foda_de_una_escuela_ejemplo.pdfIn PDF document text
    • http://istra-backwater.ru/dulika1qojo.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/ghdjbij/28670173859.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/D8Ogdhi/star_wars_galactic_conquest_board_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jezobasit/31586642297.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/use_of_its_and_it_s_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/which_generation_echo_dot_do_i_have.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/wefovupaxobekuteruma.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/dukufikatorokin.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/jodha_akbar_full_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/xedovunojoden.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/chinese_song_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/53239579037.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/96413911467.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/adblock_for_chrome_android_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/47194125676.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/puedo_superarme_bernardo_stamateas_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5204 bytes
SHA-256: 4bd6c8e896228c683eba321499cc1ae7ee74f1ba4149a862bb24f4c154a2ccef
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 11668 bytes
SHA-256: 3adcc37676f1a2a0d92bca9d574b3e204b757a278340e599a6bca521ed02060a
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 16324 bytes
SHA-256: 14f529691fa627862f89e6d87f6628181cad22c6b9874078ef1af99c1303ae48
font_03_sfnt_off0001449f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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