Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef30dd45e8e5ea1…

MALICIOUS

PDF

79.4 KB Created: 2021-03-11 20:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 04cc339c861bf4e79b3696605931715f SHA-1: 94ac592b6cea1eaab2c428827bd5dc40aff11f62 SHA-256: 1ef30dd45e8e5ea139ee935bc2dda8a638296429e830e1a1c029f0df11ca2df3
126 Risk Score

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 0.9998

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://dafemum.ru/award?keyword=caseous+lymphadenitis+pdf PDF link annotation
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/dalujo-xixafas.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/fijasubonagafat_pamitimomomuref_jebutoxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/xhgbnsl/25997331234.pdfIn PDF document text
    • http://ledy66.net/boitier_an-peq-15_led__green_laser_fmasivin.pdfIn PDF document text
    • http://gouliwer.online/verb_worksheets_for_grade_3_with_answers8szzk.pdfIn PDF document text
    • http://doxewoga.iblogger.org/rangers_apprentice_book_3.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/KXYtjjd/get_likes_on_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/dgj8L6v/69497337751.pdfIn PDF document text
    • http://centerverifybadge.com/centurion_defence_academy_lucknow_fees5oft3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovutemikinodow.rf.gd/79864292452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20527559-0585-44b3-9b8e-b1f2e72e17f9/frp_bypass_apk_samsung_grand_prime_pro.pdfIn PDF document text
    • http://lapekekefexe.rf.gd/81575760706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4780ac19-9fcd-43a2-a911-33c49914cbd0/roman_numbers_worksheet_grade_4.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/junji_ito_art_book_ikei_sekai.pdfIn PDF document text
    • http://tizovosavudufi.rf.gd/up_agriculture_online_form_2019.pdfIn PDF document text
    • http://pegolika.rf.gd/aircraft_maintenance_school_in_cebu.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_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 5192 bytes
SHA-256: f89ce6cf7da73ee12ec4d75fd6cf9ec8b2454760776aabdb23c23aa62f879bcc
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10988 bytes
SHA-256: 7e79c6233cbb85e28b965cf8f792289d0462fa92b126d0849a2e8daa15badd21