Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ad00cbbd9103f9…

MALICIOUS

PDF

75.3 KB Created: 2021-01-24 10:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6ac01249b4650104ed656c94061c2a71 SHA-1: 75d090622714853c5a5657234086fcc11b3a6270 SHA-256: 21ad00cbbd9103f9708abd5d045e9af955f03185514b68c92285b0831d23237f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one specifically pointing to 'https://seumenha.ru/aws?utm_term=video+wallpaper+windows+7+software+free', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm designed for SEO manipulation, likely to distribute malware or facilitate phishing.

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://seumenha.ru/aws?utm_term=video+wallpaper+windows+7+software+free PDF link annotation
    • https://cdn.sqhk.co/sawowudin/ggYifP5/32363508315.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/5458870.pdfIn PDF document text
    • http://prostosite.site/28081518468ji384.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/ghikhju/realpolitik_game_mod_apk.pdfIn PDF document text
    • http://clientesdkb.com/nda_exam_2020_question_paper_downloadhpsmd.pdfIn PDF document text
    • http://mysteps.online/how_to_play_mancala_printable_instructionsibfx3.pdfIn PDF document text
    • http://bonboxstudio.com/online_mazes_for_3_year_oldsypsz8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://towupew.epizy.com/scholastic_guided_reading_level.pdfIn PDF document text
    • http://karifopiti.epizy.com/57986760868.pdfIn PDF document text
    • http://mowilutom.epizy.com/badoposiwigujonagamibamo.pdfIn PDF document text
    • http://jinoratizoja.epizy.com/darufirewi.pdfIn PDF document text
    • http://gipatoxusopupos.epizy.com/jasokavor.pdfIn PDF document text
    • http://nifopufu.epizy.com/lulegazutepugidixo.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5172 bytes
SHA-256: 242f03fb47171c201ab20e50e5e75833e66c62c5cf0fb34f2125940d8bd19b28
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 11252 bytes
SHA-256: 0336c1347d488621d6510a8f450574f06f9d627c0020d7ece0e40973bd6d1909

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