Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdb3dc9d5ec2b25…

MALICIOUS

PDF

74.8 KB Created: 2021-02-17 22:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0571e07841f37febe3c54530154e7860 SHA-1: 5c05cedb468d99f2a00bfcd64291b2cd92d1d96d SHA-256: dfdb3dc9d5ec2b2516deff9df2e503710ea5b0c0b0850634ded78880e82e826f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://jacksth.ru/wix?keyword=oraci%25C3%25B3n+de+protecci%25C3%25B3n+ala+sangre+de+cristo PDF link annotation
    • https://cdn.sqhk.co/guledijuxi/dChcjOL/ludo_king_facebook_login_problem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fdb10e17a73a.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/iHhfoib/dolemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ffc55679926e.pdfIn PDF document text
    • http://apparentlyopt.com/695174093037hak1.pdfIn PDF document text
    • http://wowitaly.pro/90776559118p1l9y.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/TiaOubu/falling_ball_game_y8.pdfIn PDF document text
    • http://chaptejvxz.fun/45287451777dnl7j.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ifx5Sjh/hello_sharechat_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/dkPhdja/bipezobuzotegoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pirafabitibabik.rf.gd/information_technology_meaning_in_french.pdfIn PDF document text
    • http://kepatuzazavew.epizy.com/excel_dashboard_templates.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5404 bytes
SHA-256: 216f9a252e29c04ddc9253b0824bcef1cb4ea69f45bdb957769e9f0180cf6e71
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11520 bytes
SHA-256: 9ec725ee719f54ee00d60928759ecf94bc1c8950508af1e94123f66b665d3ec9

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