Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f96431b787a89b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 10:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 615226f44717a12f11b59f1e12203f18 SHA-1: 269376fd721f1a9c3bfd588421f104f0bd5901f9 SHA-256: 67f96431b787a89bec9b34a48f8313a9718fedae1b809611017ebaef14ad22ad
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=what+is+evening+primrose+oil+tablets+good+for PDF link annotation
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/tavejitoj-wunalu-tapawexezaral.pdfIn PDF document text
    • http://itasda.online/importancia_de_la_ciencias4n85.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/lekogonu.pdfIn PDF document text
    • http://copyright-securityx.com/xenakis_metastasis7p9s7.pdfIn PDF document text
    • http://creditinquiry.info/lexile_reading_level_chartqa0e6.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/lajawageteruvedemojabifeb.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/tizufupikelaxigovukoxika.pdfIn PDF document text
    • http://vknart.xyz/attack_on_titan_season_3_episode_1_wikio9a6s.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/zopisiroged.pdfIn PDF document text
    • http://creamwalls.online/lifozoberew02bx.pdfIn PDF document text
    • https://xaliwituxezaxe.weebly.com/uploads/1/3/5/3/135323019/d9a07f198fc5.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/6878846.pdfIn PDF document text
    • http://frukt.fun/bharathiyar_kavithaigal_book_free50dcs.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/vampire_diaries_season_6_episode_10_summaryt82zk.pdfIn PDF document text
    • http://trokot-tonirovka.online/xidisuzeminajanimojivbuas.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/samsung_rf267_troubleshootingunv8j.pdfIn PDF document text
    • http://kompledom.com/how_to_use_a_focusrite_interface_with_a_chromebooks6isb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/38109669290.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/81740239407.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/dozibuwanavoba.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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5668 bytes
SHA-256: 224b3585eba84ca641204e1b4336990304ddb8a89715324d9ced510d4efcc580
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10940 bytes
SHA-256: 5340a05a8c5655b6d68b8cf80b31642ebd79430597d80db2a417956fa0c09074