Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ac17b8f6ce5388…

MALICIOUS

PDF

71.8 KB Created: 2021-03-03 17:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad95e03184b49f97ae88236427fb62dd SHA-1: 1665d1483729862ee4f6973886a86343ad2e6ccf SHA-256: 47ac17b8f6ce538879d1a7218b482e27c3ece3b993f4afd3bba5392ac4ee341c
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 0.9997

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://vilenefex.ru/award?keyword=a+study+in+scarlet+and+blue+spider+man PDF link annotation
    • http://xanimupa.22web.org/10854699374.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/jay_z_black_album_full.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/ramexaboragibekuluso.pdfIn PDF document text
    • http://kolejuf.iblogger.org/how_do_you_do_in_text_citations_in_chicago_style.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/2909597015.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/the_missing_series_2_episode_1_review.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/what_age_group_is_the_book_smile_for.pdfIn PDF document text
    • http://xirixakexove.iblogger.org/pizidovuva.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/poxek.pdfIn PDF document text
    • http://malitaludim.iblogger.org/3594862639.pdfIn PDF document text
    • http://migunovaj.iblogger.org/darkshore_mounts_guide.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/lezopobigeza/mirojajiv.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/maus_summary_chapter_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/top_10_android_emulator_without_graphic_card.pdfIn PDF document text
    • http://golofupatawef.epizy.com/contractions_with_not_worksheet_free.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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 5452 bytes
SHA-256: 7dc05667b556fd6ede1e039f9e3d8876df7a05fe4afcb9ceda7a0fc52995a6d4
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10324 bytes
SHA-256: ed86c4625a489cb658a00fb898dfd17526930663bb39530d79fc3696aeefdd5b