Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a5b1b57ecdcfed…

MALICIOUS

PDF

84.0 KB Created: 2021-03-24 10:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f8c63727fc3eb433aa2821ec7fd27d8 SHA-1: 284dce845d02e023ac02cbde00c22f2ae71adf0c SHA-256: 71a5b1b57ecdcfedca0f4630b4cc07bc420e0870d1cbbd6d28c756f0d080b2b4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one specifically identified as an external URI, suggesting it's designed to redirect users to potentially harmful websites. The document body, though partially corrupted, includes metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=funny+ways+to+say+i+love+you+more
    • http://idealica-ordina.site/nordstrom_uppababy_vista_v2_saledxet8.pdf
    • http://kogutojoveso.mywebcommunity.org/task_scheduler_return_code_0x3.pdf
    • http://zespodsvetkoy.site/states_of_matter_word_searchnbj4h.pdf
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/nuramunofufuxa.pdf
    • https://cdn.sqhk.co/kolazapikib/UoX0jvw/76742816230.pdf
    • http://gewusoluxul.scienceontheweb.net/yunus_cengel_termodinamica_descargar.pdf
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/lubirazebodidi.pdf
    • https://cdn.sqhk.co/zimidenex/kjajbpp/bemidovizuvojodemonepom.pdf
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/2903636.pdf
    • http://geparup.scienceontheweb.net/25533666325.pdf
    • http://lebedugipul.mywebcommunity.org/miveditasomopemavag.pdf
    • http://nijalatol.mypressonline.com/dufijasolavemes.pdf
    • http://xipodijajul.sportsontheweb.net/math_in_the_modern_world_syllabus.pdf
    • https://cdn.sqhk.co/vibefoparo/lge6jjO/file_manager_apk_for_android_6._0.pdf
    • https://cdn.sqhk.co/zelosoza/jajdodi/38747090397.pdf
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/690ff719c37e.pdf
    • https://cdn.sqhk.co/jaxabofapuw/idgdgjQ/percentage_change_formula_in_excel_with_0.pdf
    • http://vutunema.mypressonline.com/que_es_psicologia_comunitaria.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_673bb7fa352c477d88a4572a40136120.pdf?index=true
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_99601fd0468b43b7aa3eeaab588e935c.pdf?index=true
    • http://pofitubawonu.atwebpages.com/mixing_ratio_of_concrete.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7c.bin
9f7a9ccf800847151e9357e9fa86c458bb191a7d699aaec3af8ac863604c70ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 5040 bytes
font_01_sfnt_off00011dab.bin
a9a9bf101126cdb496a20366aa2bce5963e8459246093ec45f270b6889698d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 10776 bytes

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