Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26085654b03338a…

MALICIOUS

PDF

78.2 KB Created: 2021-03-23 22:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdd3d3950c8569c445a9dfd26624c494 SHA-1: d17056cf3a584a497ac9d9d4634d26e7c51f8019 SHA-256: b26085654b03338ab1c9288baf7802cc4197c197c0767f9c73316549fa908e13
104 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 'kuzutuzo.ru', which is likely a lure for downloading a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/wix?keyword=zayn+book+pdf+download
    • http://bipudal.iblogger.org/what_is_the_difference_between_the_ruger_lcp_and_lcp_2.pdf
    • http://lavorunolutoga.22web.org/snake_pass_pc_game_free.pdf
    • http://gejudoxe.mypressonline.com/what_are_the_benefits_of_juice_plus_boosters.pdf
    • http://dilurijarejo.22web.org/40448351972.pdf
    • http://nuwojukow.mygamesonline.org/juregijixowozibim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xaramoturowuf.rf.gd/american_history_reading_list.pdf
    • https://s3.amazonaws.com/batoragubukepo/lujatezilewotuma.pdf
    • https://s3.amazonaws.com/waxegatulo/ionization_energy_and_electronegativity_worksheet_1.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/casio_sgw_1000_battery_change.pdf
    • http://gibagefozilot.epizy.com/86351038253.pdf
    • https://s3.amazonaws.com/gopifu/76365062194.pdf
    • https://s3.amazonaws.com/dusubonifu/high_frequency_words_worksheets_for_2nd_grade.pdf
    • https://s3.amazonaws.com/vuterijoze/playstation_vita_tv_gamestop.pdf
    • https://uploads.strikinglycdn.com/files/af9555b1-bd89-42c6-8ad9-1da1b25b46f7/how_to_start_a_dewalt_3000_psi_power_washer.pdf
    • https://s3.amazonaws.com/pibajuwi/marriage_registration_certificate_up.pdf
    • https://uploads.strikinglycdn.com/files/5ada1b42-5819-4831-868b-a7025c7b15e8/tepuzaguwujuramigujilo.pdf
    • https://s3.amazonaws.com/xeroguru/62382826540.pdf
    • http://gumusimigogasuz.onlinewebshop.net/80274425576.pdf
    • https://s3.amazonaws.com/gumegulaxi/gipewapofijubaxizubipem.pdf
    • http://gitogopafo.epizy.com/video_lagu_bts_dna_mp4.pdf
    • http://livirava.atwebpages.com/36803848286.pdf
    • https://s3.amazonaws.com/zidosozawok/physical_examination_and_health_assessment_book.pdf
    • http://pifazudiso.rf.gd/chemistry_placement_test_study_guide_csulb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58d.bin
6c5562641b6f060703776a5bda4df4ba0806299f178160137053bae12abdd546		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 4660 bytes
font_01_sfnt_off0000f582.bin
e1e3a4eb6b5724c2c863f43133f8a7f45facd8e15fe5e4bc766c48e337718889		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 11732 bytes
font_02_sfnt_off00011d93.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 4324 bytes

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