Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d91597e4bee5f32…

MALICIOUS

PDF

80.7 KB Created: 2021-04-11 18:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f532902dcc6cc5bada22d3af0030fad SHA-1: 216c433e5384edc71e303d013b0829053117b57f SHA-256: 5d91597e4bee5f322505dae7fb8be4d41bdd3c47d336f567f4869696a6e022d2
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, and it contains an embedded URL that leads to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'software tester resume example'. No scripts were extracted, but the presence of an external URI and the phishing detection indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=software+tester+resume+example
    • https://cdn-cms.f-static.net/uploads/4375909/normal_60297bc9df631.pdf
    • https://cdn.sqhk.co/nodujugebi/gjU2sL2/70761820336.pdf
    • http://varistop.site/whats_another_word_for_single_solutionxqfvq.pdf
    • https://cdn-cms.f-static.net/uploads/4459625/normal_60359a4563eb7.pdf
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5ff28f42506b0.pdf
    • http://contentmedialiteracy.com/download_eraser_serial_codegpklo.pdf
    • https://cdn-cms.f-static.net/uploads/4466413/normal_601a38a4a3d60.pdf
    • http://verefdliyvtorogo.xyz/super_start_power_pack_how_to_charge6npf9.pdf
    • https://cdn.sqhk.co/zururodi/IhhgcZZ/the_adventure_girls.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn.sqhk.co/kososojog/hjSQ8jd/toca_kitchen_3.pdf
    • http://vivaxuza.iblogger.org/tozijilibatukij.pdf
    • https://cdn.sqhk.co/salobosemiv/fjcghfr/37650717945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kagokonutuvep.epizy.com/forged_of_blood_guide.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_9a5cd9cf7a1b46a2b3df0edd459c981d.pdf?index=true
    • http://nezepipiniwaj.rf.gd/jowexamewubeko.pdf
    • http://suguxamux.epizy.com/jspdf_autotable_header_font_size.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_f9f0ea65fc684616acb7191d6ca695fa.pdf?index=true
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_137d9aa7108443c0b712f95ae21f1278.pdf?index=true
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_709becfe02554ea78771f0abf9e97dd4.pdf?index=true
    • http://gijufebevavudep.rf.gd/general_knowledge_abbreviation_list.pdf
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_3f80fc8406d648f298412ddff818ec9e.pdf?index=true
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_9632bc1e0633401098f797568b5cd351.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_badda42e34004ca69e67afd0c191cf3e.pdf?index=true
    • 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_off0000fa62.bin
ca1d992e3ee05c6d32af78d66e9d4c97a7b129f7815218f6e7d21653d5e2a758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5308 bytes
font_01_sfnt_off00010c76.bin
d8c7755ed69662c9ad26537314b901e5fbed35be9959f146375c8f1da5b9acf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 12044 bytes

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