Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24aacca66bc2f3b…

MALICIOUS

PDF

75.5 KB Created: 2021-02-17 11:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0e1e9c9283bf80d49c092035805f345f SHA-1: 2ce3e048bc8f7aee2f62109d8197fc26b91e43fe SHA-256: c24aacca66bc2f3b4050c2e38cbaa891d8a9b1bf1294e8bb42c97db012b726bd
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://bologen.ru/123?utm_term=optiplex+gx620+sound+driver+windows+7+64bit PDF link annotation
    • http://eglo.club/vsco_x_all_filters_apkthl6v.pdfIn PDF document text
    • http://visionnew.xyz/android_tv_box_makro12um0.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/c2Nohdp/bc_hockey_coaches_code_of_conduct.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/ifjbTnQ/best_islamic_ringtones_without_music.pdfIn PDF document text
    • http://presentinsta.site/acronis_true_image_2017_iso_to_usbmocpe.pdfIn PDF document text
    • http://hookup154.site/image_converter_plus_serial_key4cp2m.pdfIn PDF document text
    • http://medicalpracticementor.com/bhilwara_milgi_re_hd_videos9hhg.pdfIn PDF document text
    • http://samettemiz.xyz/giduzetofax5ezhe.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/shdzhiS/rukom.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/hYgcjjt/lips_art_makeup_game_perfect_lipstick_coloring_sheet.pdfIn PDF document text
    • http://in-step.shop/xapirulorosakevebasuep32x.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/lososimap/6718937462.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/availability_reliability_and_security_in_information_systems.pdfIn PDF document text
    • http://doxewadafexe.rf.gd/following_directions_worksheet_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/android_box_iptv_ykleme.pdfIn PDF document text
    • http://zodumuf.rf.gd/lilezetofogovemefog.pdfIn PDF document text
    • http://wujasulo.epizy.com/ipsoft_annual_report_2018.pdfIn PDF document text
    • http://felawikemuda.epizy.com/xepib.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 5900 bytes
SHA-256: 5ea0de76e7b8f77bd74e2e05ffc47583648e03e4e53e577a289b606f76d463c2
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 11184 bytes
SHA-256: ded2bfa5a970f4ecf42c1741a72f4bd8bf117404587a6c58e2f7aa5e93be33fd

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