Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dbdfcc2a0fc407…

MALICIOUS

PDF

78.7 KB Created: 2021-04-10 08:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 94c9880bef6c5ced3a7c95fb51f36866 SHA-1: 7ec6010b1583c26070007f33380a5984e7c5ad4f SHA-256: c8dbdfcc2a0fc407e928538520f9a19693f49ce344f89f0a3b9fcbc50e8ba0b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+pass+the+nasm+cpt+exam+2018 PDF link annotation
    • http://vbruti.site/banco_do_brasil_new_york_swift_code166yg.pdfIn PDF document text
    • https://cdn.sqhk.co/zowegifivufo/ilNH0if/banana_splits_song_ringtone_free_download.pdfIn PDF document text
    • http://texno3ua.com/31244408718rsipb.pdfIn PDF document text
    • http://regse.website/escribir_para_comunicar_ideas_pensamientos_y_sentimientosqwxip.pdfIn PDF document text
    • http://anarchymedya.com/reflection_mulan_piano_sheet_music7opl2.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/gehbjid/58291030345.pdfIn PDF document text
    • http://moresukko.ru/what_kind_of_character_is_the_nurse_in_romeo_and_julietip50d.pdfIn PDF document text
    • http://santaparker.store/pafagasaxukomsrgdg.pdfIn PDF document text
    • http://azorocheat6.xyz/visezuxabuna1wz8.pdfIn PDF document text
    • http://hurricane1.space/vopemakifutu7s5.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/fichagd/download_dino_factory_mod_apk_android_1_coc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5fd64f90ad9a6.pdfIn PDF document text
    • http://rubka.space/krk_audio_tools_apk_downloadfpsr0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_600c8db7bc8ce.pdfIn PDF document text
    • https://cdn.sqhk.co/silijebutu/ig8hj9u/gallery_wall_set.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/hbBIKHc/17591870087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_6066a32516d02.pdfIn PDF document text
    • http://vovpomnim.ru/vegojorelusenododw2zdg.pdfIn PDF document text
    • http://tehnotop.space/161590357228p2um.pdfIn PDF document text
    • http://baltika-trans.com/dell_mini_operating_system_not_foundbyxr0.pdfIn PDF document text
    • http://raisinshub.pro/538377425586j644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tazopaju/how_to_clean_printhead_on_epson_workforce_3640.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/platform_cafe_watford.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/83427716068.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/how_to_use_dish_hopper.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 5424 bytes
SHA-256: f964d08e5f0d570d9ba04b3d04f25be93d0975746bb376bbb66fd3868ef6877b
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10124 bytes
SHA-256: 365f8a70200b95ead69c0f2b6ab96a8c01207b713d68a16b7b1174133401df93
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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