Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cf27585966a5df…

MALICIOUS

PDF

87.4 KB Created: 2021-03-19 16:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0ba4c42902717c9211b2c522f596a8ed SHA-1: 918f7a8d5012240c3ed008a421492d2873e04211 SHA-256: 40cf27585966a5df5319b29daf8d1b62f3bba30b91b7e2bba9f5bd890e6630f7
146 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one pointing to 'botokaw.ru', suggesting a phishing or malware distribution attempt. The malformed stream length heuristic further supports the presence of malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=math+formulas+to+remember PDF link annotation
    • https://cdn.sqhk.co/kefiruge/fgfihUI/identity_v_hunters_birthdays.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/gM5ijge/download_mod_zombie_survival_gta_san_andreas_android.pdfIn PDF document text
    • http://natlegend.space/vozituvakesawuhukuq.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jeghJxD/nitutakiwikunaxadofukasad.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/3tVidih/moxim.pdfIn PDF document text
    • http://verifybadgehelp.com/lifirawelutunufiveko2zno.pdfIn PDF document text
    • http://powerpoint4you.ru/principal_software_engineer_jobs_in_dallas_tx1evpr.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/nhficie/movefajabezirusi.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/ggJjfty/sugabitiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/tcOibia/configurar_correo_icloud_android.pdfIn PDF document text
    • http://mebets.xyz/bejeweled_classic_full_apk_downloady2mn6.pdfIn PDF document text
    • http://vijakaru.iblogger.org/rodak_s_hematology_4th_edition_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovugi/football_manager_handheld_2021_best_tactics.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/vetiwiloberof.pdfIn PDF document text
    • http://fapibudu.epizy.com/93623562693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f998916d-b771-4a84-9da3-7d22cad7e45c/98168725464.pdfIn PDF document text
    • http://wikatamuk.rf.gd/muwepuvelegagado.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/praying_the_rosary_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d2ffe0-4b17-47a7-8229-2b5da000ed90/wufupumor.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/ayushath_awasan_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/dapuf.pdfIn PDF document text
    • http://xugibomexepef.rf.gd/arctic_king_air_conditioner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5e8165-ebb9-462d-abb1-8867bc5e5f1c/buwazunujo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 5152 bytes
SHA-256: 023cea6b228b67be547224fe9effe436da7802f0ddf0834f8b73cdb9d9350b2c
font_01_sfnt_off00012750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12750 12028 bytes
SHA-256: 23542c58e003a62d9665afa2d48afc36fafe79e0f57ac35f4cda262d42d30800

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