Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07f3dd82d077aac…

MALICIOUS

PDF

90.2 KB Created: 2021-05-13 20:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42cadd07a90f3f456046ac06f6042008 SHA-1: 2078eba0d06402b4844280edb7dbff5c71dfda31 SHA-256: a07f3dd82d077aac3ca2d75587d4bd5e021cf44f85590e87ee69aa5c1c52acdf
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains an external URI pointing to 'kuzutuzo.ru', which is highly suspicious. While the document body is heavily obfuscated, the presence of external URLs and the overall detection suggest a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+to+connect+atem+mini+to+atem+software+control
    • http://lofoporubatul.mygamesonline.org/basic_architecture_books.pdf
    • http://ridaxaki.mywebcommunity.org/14793859825.pdf
    • http://sipataj.sportsontheweb.net/51571137549.pdf
    • http://kevarusakoko.mypressonline.com/2017_scag_tiger_cat_2_review.pdf
    • http://rejemezurufoveg.mywebcommunity.org/50906182823.pdf
    • http://jatudoz.getenjoyment.net/online_gift_shop_business_plan.pdf
    • http://wejaduz.mypressonline.com/statistics_with_r_best_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75a713a8-d392-4017-bae9-5cb2192f4652/technical_chart_analysis_book.pdf
    • https://uploads.strikinglycdn.com/files/ea5340ac-8e7a-4a49-888d-aa417ea35d4a/46881978102.pdf
    • https://uploads.strikinglycdn.com/files/f500e051-d9be-4d9f-8dae-35cc849f9b8a/how_to_turn_off_service_advancetrac.pdf
    • https://s3.amazonaws.com/bupesejirijejus/meade_12_lx200_gps_telescope.pdf
    • https://s3.amazonaws.com/zozofufulolig/disregarded_entity_fatca_reporting.pdf
    • https://uploads.strikinglycdn.com/files/6fb45197-e37e-4d72-ac26-86f55282c705/carl_jung_personality_test.pdf
    • https://s3.amazonaws.com/ribowexulo/xudobesalo.pdf
    • http://madigekole.onlinewebshop.net/zalilimomipiputudoravot.pdf
    • https://uploads.strikinglycdn.com/files/e453b12a-d8dc-4334-bc8a-fce0e3500190/15596957716.pdf
    • https://uploads.strikinglycdn.com/files/90545acf-f278-4a57-9630-94481f4a2716/7.3_transmission_fluid_check.pdf
    • https://uploads.strikinglycdn.com/files/f234ef5b-2983-43af-8c58-5d82e3630733/find_last_used_column_name_in_excel_vba.pdf
    • https://uploads.strikinglycdn.com/files/7b3a34c7-5b2d-4600-8b08-3fb1d44c821b/el_pollo_loco_menu_low_carb.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_off00010ff1.bin
553523803290bd6792af111fb504597ac4c8523dac5cfbc1b838f09f8cfae5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 5080 bytes
font_01_sfnt_off00012132.bin
88933997c5ab48626f9bcb30be9d8020119d45c5201582d53f5fe9e3f0a24f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 10384 bytes
font_02_sfnt_off00014479.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 16060 bytes

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