Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e67bcaa1b64ada9…

MALICIOUS

PDF

73.0 KB Created: 2021-02-06 20:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 66564c60eac5ba33372158b9785d8e83 SHA-1: b88c54cc8a67ae1fd67850db7753e4d907a2013d SHA-256: 0e67bcaa1b64ada9e92e84ef94e3992b5f35f8d5191ffe273644a123ea458ce0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'academic essay example pdf' and the wkhtmltopdf tool, likely a lure to disguise the malicious nature of the links.

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://seumenha.ru/wb?keyword=academic%20essay%20example%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491925/normal_6004814bc9301.pdfIn PDF document text
    • https://sanexopapodepal.weebly.com/uploads/1/3/0/7/130739353/xezege.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/4732767.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/thhgitP/movie_quiz_2018_with_answers_level_8.pdfIn PDF document text
    • https://cdn.sqhk.co/rowofabuf/aDjdZTZ/iphone_multiplayer_snake_games.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/5b3a3df7cd989b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_601b4725840ad.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/iihg3ia/scotland_world_cup_1990_qualifying.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/hhqjcij/71492980003.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/gugejbn/regal_cinema_movie_showtimes_today.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/24ea780ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_6012119b2b6f3.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/top_10_android_phones_2018_philippines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_5fff0a7217aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ffa4eb02fbe7.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/6225625.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/ehACgi9/miriviludomufemumabiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolavewavesuj.epizy.com/punutaladotematodedo.pdfIn PDF document text
    • http://darelarara.epizy.com/99883603994.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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 5364 bytes
SHA-256: 9f8b4980111ae5a89bf099fe9e1e824ca74527e945b621f452acd8be462efb8a
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10416 bytes
SHA-256: 6814acd6173cd2264201fefef9619a31f36778d3fdd2d947d045c8f6455afa12

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