Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e250582bb18bbf2…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 08:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5f331f1f12a9511fc7faa89c0d01ada SHA-1: 7b1102e0a20132e9686d7db62d06c882e50e01c0 SHA-256: 9e250582bb18bbf2618c4b597bc2cfaa4c7b1f80a49a3ae067fedba29f5854a1
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'accelerate learning answers' and the wkhtmltopdf application, suggesting a social engineering pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/wix?keyword=accelerate+learning+answers
    • http://retapadu.medianewsonline.com/57274806188.pdf
    • http://bejisosubonito.sportsontheweb.net/16096168333.pdf
    • http://jogajep.medianewsonline.com/enterobacterias_patogenas.pdf
    • http://davupopebuwiser.sportsontheweb.net/sex_drugs_and_cocoa_puffs_by_chuck_klosterman.pdf
    • http://nurigoluda.mygamesonline.org/moorish_literature_noble_drew_ali.pdf
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fdfbded653f2.pdf
    • https://cdn-cms.f-static.net/uploads/4477181/normal_601bafe4f215d.pdf
    • http://ragofilud.medianewsonline.com/vetuvojodipakaxavogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3143c58e-c0b6-4bde-a383-917e95c69f30/24467802717.pdf
    • https://uploads.strikinglycdn.com/files/ce6549d9-c724-4888-8e0e-ef2968da6d1a/synonyms_worksheet_10th_grade.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/botaruzolazuzimaga.pdf
    • http://fuxunowelujuxa.atwebpages.com/how_to_reset_my_2wire_router_password.pdf
    • https://uploads.strikinglycdn.com/files/767429bf-c039-415c-b7cc-cc8ca32df769/is_the_old_testament_in_chronological_order.pdf
    • https://s3.amazonaws.com/vedexajawo/betting_predictions_apk.pdf
    • https://s3.amazonaws.com/gewisetug/game_chin_thut_ging_commandos_cho_android.pdf
    • http://mepitar.atwebpages.com/types_of_curriculum_innovation.pdf
    • https://s3.amazonaws.com/ruzaganog/kesefinudoro.pdf
    • https://s3.amazonaws.com/nodetuxapabara/echo_attendance_app.pdf
    • http://dapibudajemuk.atwebpages.com/apostila_calculos_trabalhistas_2020.pdf
    • https://uploads.strikinglycdn.com/files/6b8ca939-cf4c-4761-b8f0-f8e7b2b95147/rosesesud.pdf
    • https://s3.amazonaws.com/tuxutedi/jixomelilukorenifigoxugut.pdf
    • https://s3.amazonaws.com/dosipive/how_to_open_the_back_of_a_timex_indiglo_watch.pdf
    • https://s3.amazonaws.com/rujabepifar/41758337091.pdf
    • https://uploads.strikinglycdn.com/files/140b7a1f-7a86-495c-8a4b-db9eb56ea221/jakosej.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010671.bin
64e32a969a3880f04505a437ab20bf728e774b2302ac3c450908aae0bebb02fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 5048 bytes
font_01_sfnt_off000117bd.bin
bd3b3389963b466afa42494d24d5045a33ddbaecb48ad17ec7541d4e648ddec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10740 bytes

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