Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb2406192a6c446…

MALICIOUS

PDF

127.8 KB Created: 2021-03-18 01:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 09a2eed3b0a331f32b805a7223b2617e SHA-1: 963f0c2048f69823448012f96d25aca15166da80 SHA-256: 7bb2406192a6c44630200ee8f3464420e5a3b947ab31cbe7541021b9fcaae9a9
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with a significant portion pointing to disposable or unknown-reputation domains, suggesting a link farm or phishing lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' also suggests potential command execution, possibly via embedded scripts or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://soxebez.ru/award?keyword=council+of+chalcedon+451+pdf PDF link annotation
    • http://bristol-yalta.run/cancer_de_utero_enfmdkf.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/gh0Fjhc/mupuku.pdfIn PDF document text
    • http://gevazuvunurodum.22web.org/windows_10_cmd_commands_cheat_sheet.pdfIn PDF document text
    • http://fuvunopulo.22web.org/78680998706.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/bUhjCjd/37890973398.pdfIn PDF document text
    • http://stnold.com/the_vampire_diaries_season_1_episode_2_full_episode304wj.pdfIn PDF document text
    • http://wei-nmvc.com/wirenoxipajusi7xzln.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/FjTqhgm/lakeje.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/cadastral_information_nz.pdfIn PDF document text
    • http://gemotebefid.22web.org/articulo_de_la_constitucion_mexicana_que_habla_del_derecho_a_la_salud.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/higdxPy/infiniti_commercial_song_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/IjeJrie/dimozapowuxero.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/j8j2khe/electrical_installation_calculations_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mamesejo.epizy.com/8367866586.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/what_is_a_good_wattage_for_a_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/application_form_for_canadian_passport_renewal.pdfIn PDF document text
    • http://xozitejazezo.rf.gd/el_caballero_de_la_armadura_oxidada_analisis_literario.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/ffiec_009_reporting_seminar.pdfIn PDF document text
    • http://fuxufotab.epizy.com/15273163678.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/18441498796.pdfIn PDF document text
    • http://lutidufewujasa.epizy.com/zajutokusi.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/ios_13_beta_8_ipsw.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_off0001a0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C3 5136 bytes
SHA-256: 3593c38f85f50a56ffc849b8f0a4df9341b1c90784963c6fa61a34fb92738778
font_01_sfnt_off0001b251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B251 22116 bytes
SHA-256: 5cace2151e707f690ef6aa104aed80b95f89efe980e21879e459f6c9ed487880