Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b3618aa8316f6b…

MALICIOUS

PDF

97.4 KB Created: 2021-03-19 22:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c93194c2d39a539af1456a4295a91d SHA-1: 3a029201be14d62bd49d7559dcbe643ba4367bcf SHA-256: 54b3618aa8316f6bc71366830fc41562be384e3cc21ef692fd121d213f675823
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://jacksth.ru/wix?keyword=the+pale+blue+dot+pdf+free
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6019210cb3b7b.pdf
    • http://nariwunuzaw.scienceontheweb.net/tcp_ip_protocol_layers_in_hindi.pdf
    • http://bumasujofoj.getenjoyment.net/watuwevafaloxi.pdf
    • http://dress-russia.ru/850563957114dequ.pdf
    • http://ukrdomonis.xyz/luvawige9fr0z.pdf
    • http://sajiwurejedetu.sportsontheweb.net/ctet_question_paper_1_2020_download.pdf
    • https://cdn-cms.f-static.net/uploads/4500878/normal_5fe9687d97062.pdf
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5fe10593a0a99.pdf
    • https://cdn-cms.f-static.net/uploads/4450427/normal_605196d404372.pdf
    • http://subbellassecret.com/lexojirepowokozevuliwodpoyz.pdf
    • https://cdn-cms.f-static.net/uploads/4407303/normal_602bfee364800.pdf
    • http://1s.london/robux_generator_apk_pcu1eaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/muvemasoxaji/85291546437.pdf
    • https://s3.amazonaws.com/nilafafakem/how_to_use_photoshop_cs4.pdf
    • https://uploads.strikinglycdn.com/files/e0be48b1-4666-4580-87aa-f4265674a1f4/how_do_you_use_a_hoover_steam_mop_on_carpet.pdf
    • http://tofekerotireg.rf.gd/our_god_chris_tomlin_ukulele_chords.pdf
    • https://uploads.strikinglycdn.com/files/1fba0678-b6bf-4d6c-b1ca-d03fb6bfa57a/interior_design_salary_an_hour.pdf
    • http://wetowudokik.epizy.com/amazing_grace_piano_accompaniment_free_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/7460a0e9-0278-4bc0-81f7-035c7165da4b/66303763421.pdf
    • http://vewawisu.onlinewebshop.net/jomobenaruzurikamuz.pdf
    • http://xugonowelimije.epizy.com/tv_guide_antietam_cable_hagerstown_md.pdf
    • https://s3.amazonaws.com/ravuxudibure/51529260455.pdf
    • http://piwakitidi.onlinewebshop.net/puwobum.pdf
    • http://pegireg.rf.gd/canon_lide_120_spec.pdf
    • https://uploads.strikinglycdn.com/files/03d25d46-bd9f-4d5d-8c6a-2265a46afeb9/40866876035.pdf
    • https://s3.amazonaws.com/polojuliragam/tipo_de_archivos_de_imagen.pdf
    • https://s3.amazonaws.com/midaguvimabof/walgreens_small_room_humidifier_ultrasonic_technology_manual.pdf
    • https://uploads.strikinglycdn.com/files/b55ee94f-6cf0-49d1-97e3-838c44473dc1/kibawavabo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133de.bin
d928d70416e110d34c71377e899c3432911932336d4f7686a55c85e8275a6cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 4768 bytes
font_01_sfnt_off0001441c.bin
9b5c33d7b846d631544a841ef98e60957128936e1dd828f17cb004bb3a3eda19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1441C 10992 bytes
font_02_sfnt_off000169d7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169D7 4324 bytes

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