Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9fc26fc1571db2…

MALICIOUS

PDF

93.0 KB Created: 2021-03-28 18:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6102a6739ae648152fe82e343d0dbf2d SHA-1: d4ed868c6783be766b5f424fa1a0ac740a06798a SHA-256: 9d9fc26fc1571db2f636cbc9c23637b7d417bc98f8091a02de5200448fe8a0e4
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=african+history+pdf
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5fe6b924bdb0d.pdf
    • https://zazigiwozaka.weebly.com/uploads/1/3/2/6/132681333/6450547.pdf
    • http://fovikoxesaweziz.medianewsonline.com/kiwanisaje.pdf
    • http://lixodamevurobar.mygamesonline.org/gramatica_ingles_completo.pdf
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/torigufut-dinonisasawek-saxokata.pdf
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5fe3b3653630f.pdf
    • http://eroganoficial.site/jenavaxekcyaw.pdf
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/291016.pdf
    • http://keruluzo.medianewsonline.com/bony_to_beastly_workout_guide.pdf
    • http://resipowepo.getenjoyment.net/types_of_validity_in_assessment.pdf
    • https://cdn-cms.f-static.net/uploads/4421200/normal_603d7cdb86a5b.pdf
    • http://salleop.xyz/letter_j_coloring_worksheetsf2b1q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/583493ff-13fc-4a00-8c3e-93032bcb889e/lujur.pdf
    • http://gosaduzunake.myartsonline.com/64098959913.pdf
    • http://kugukokoner.myartsonline.com/up_b._ed_government_college_list_2020.pdf
    • https://uploads.strikinglycdn.com/files/df04e8d1-b4e4-4c32-b8d6-169837fcec11/is_cloud_nine_on_hulu.pdf
    • http://ziwemasux.myartsonline.com/modal_verbs_worksheets_for_grade_6_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/f04a872c-7e24-475f-a93f-0c906b3c284a/bajefib.pdf
    • http://bufijonewufo.onlinewebshop.net/castle_ravenloft_board_game_pieces.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_off00012dde.bin
a2bb3c17549ce18c909dc9fad9c703042d9a91ae98684bc760c1ab0ec3c6d0c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 5300 bytes
font_01_sfnt_off00013fed.bin
7f78370851752ca68269cea0f4c1c046d5661bf467bbd29f2947fb03ee9280fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 11336 bytes