Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8cf232643610d1…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 17:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4746c33018eb25b2d48000322dcffd6d SHA-1: 9d6624adb48df4eb8c804e4135a3a4505803945b SHA-256: 7e8cf232643610d121cd1cf0487b42ab2c8d9e26b4f7f794c3e90be760ff36f1
186 Risk Score

Malware Insights

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

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 0.9960

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=how+does+buying+bitcoin+work+on+cash+app PDF link annotation
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/teriguref.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jdFhjgZ/business_powerpoint_presentation_guidelines.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/paduwoxawevi.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/5174803.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/gofefuwuregun-keraxikofesuv-vososafanu.pdfIn PDF document text
    • http://fudopajir.iblogger.org/5_ejemplos_cortos_de_discurso_directo_e_indirecto.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/kutafujikaw.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/8133804.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/jhgerih/wwe_2k20_universe_mode_online.pdfIn PDF document text
    • http://puzodidifixo.iblogger.org/avifauna_definicion.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/2924639.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/rotedexisikaxul.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/dikod_gijifesotima_kusopadaguritob_pidopopuvegep.pdfIn PDF document text
    • https://zudopawugaweso.weebly.com/uploads/1/3/4/3/134343229/717fc402c00b.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/gfaidmy/diskdigger_photo_recovery_app_is_safe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b411ece-325a-4819-abd8-9c8936381aac/how_to_memorise_tarot_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/72902074563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61df6dc2-a82a-4248-abbb-0ec694ca6509/jingle_bells_piano_sheet_music_advanced_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/jasulupebagusaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feaa608d-a378-416c-b4bc-904c1d7db2a9/63556505821.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/8876370420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4656bfa-b718-44ad-aa40-13bd847275da/difinuxemebezelizujozo.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/17493772909.pdfIn PDF document text
    • http://zelimasiropaf.epizy.com/git_rebase_command_meaning.pdfIn PDF document text
    • http://mofuvuziwoloj.epizy.com/rain_gun_irrigation_system_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc88ba7e-2d5c-4534-8194-29d20480d731/how_to_stop_skin_picking_addiction.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5664 bytes
SHA-256: 3ef26fd81b025580bfe8c29741000b507f1c298968e9521741fbe123635bdae9
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10660 bytes
SHA-256: 4b81ff6f235c69460d701f64a49245f6d640bedab995e8646671f2fdaa6dbe3c