Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b8bd550a76e51…

MALICIOUS

PDF

79.4 KB Created: 2021-03-07 19:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c77aed9626bb54f552a39c1cb0d9a7b4 SHA-1: 18365ef4f22f79348d652982ae7ba592b9f3a01d SHA-256: b77b8bd550a76e510ced21cd7da1aa4e0be594a7618f289cbeef57a883b96e6e
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'free pdf'.

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=jesus+always+free+pdf
    • http://organize.shop/tik_tok_video_2020_download9pc9h.pdf
    • http://verifedform.com/woguripirokovunajowilegy5ioj.pdf
    • http://romeital.space/kipokesexmpo2.pdf
    • http://raisinshq.pro/grant_alter_privilege_to_user_in_oracle2k4k6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zelubosomud.rf.gd/how_to_backup_iphone_notes_to_android.pdf
    • https://s3.amazonaws.com/kuxuxemu/real_estate_agency_disclosure_form_arizona.pdf
    • https://s3.amazonaws.com/zakunafu/disadvantages_of_ipads_in_schools.pdf
    • http://ditajizuru.rf.gd/25236990819.pdf
    • https://s3.amazonaws.com/wazorixekunafob/mechanical_seal_failure_troubleshooting_guide.pdf
    • https://s3.amazonaws.com/buxoparadazegu/xuperi.pdf
    • https://s3.amazonaws.com/jamuluvuvava/27461584665.pdf
    • https://s3.amazonaws.com/kawotexulozax/zaxogobaweneg.pdf
    • http://giwurebo.rf.gd/43064243636.pdf
    • https://s3.amazonaws.com/genedonapubefe/27592188337.pdf
    • https://s3.amazonaws.com/fedure/2019_dse_ls_paper_1_answer.pdf
    • https://s3.amazonaws.com/xukanomarexumu/zimatizuwu.pdf
    • https://s3.amazonaws.com/medaliwifufugel/adosphere_1_cd.pdf
    • http://zudakilaf.rf.gd/cambios_psicologicos_de_la_mujer_embarazada.pdf
    • http://bobamexexaru.rf.gd/challenge_bhojpuri_movie_hd_video_song.pdf
    • https://s3.amazonaws.com/wizakokowe/air_crash_database_report.pdf
    • http://bovuzigaratufob.rf.gd/sumerian_king_list.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/bangalore_days_ringtone_bgm_free.pdf
    • https://s3.amazonaws.com/xurixado/swot_analysis_template_excel.pdf
    • https://s3.amazonaws.com/tawosutosuxi/alice_in_wonderland_reading_comprehension.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_off0000faaa.bin
da2e700a8d0b5ef49721eca4689534f342f1d5c468ff947cb4f995c4ec5314dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 5216 bytes
font_01_sfnt_off00010c97.bin
23625450feb695987053a34c1839a05d0ac8602386ade507e96286d77059bdc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 10500 bytes