Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3a218f8ad84f98…

MALICIOUS

PDF

73.8 KB Created: 2021-04-23 04:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 58b49b5ca5ef333147affd859aff8114 SHA-1: f8839b688ec9a196ca56d74d3b480f9ed5dee02b SHA-256: 6a3a218f8ad84f9845d5124e6145cc2b80a282eb80692ec0a7977636dcee083d
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 an external URI pointing to 'https://jacksth.ru/strik', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, references 'Quicken print checks', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=quicken+print+checks PDF link annotation
    • https://cdn.sqhk.co/tibidatoxo/gitgdP5/95954138106.pdfIn PDF document text
    • http://zowefokixot.iblogger.org/adobe_acrobat_professional_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/hhQpNKa/jetabanuneti.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/hm_inspectorate_of_probation_annual_report_2018su0yy.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/XbWIicK/mibisomizazijizi.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/dgfX5hb/debaworedi.pdfIn PDF document text
    • http://geleostone.online/kimus5opu7.pdfIn PDF document text
    • http://zelebanibusoxu.iblogger.org/aloe_vera_planta_medicinal.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/ugjjhhc/bluetooth_4._0_audio_receiver_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gawabog/can_you_become_an_engineer_with_a_math_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/13466700669.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/54247025885.pdfIn PDF document text
    • http://vidokewokesun.rf.gd/3567956522.pdfIn PDF document text
    • http://depevatumelo.epizy.com/34048682823.pdfIn PDF document text
    • http://sumojoripira.rf.gd/practical_network_cabling.pdfIn PDF document text
    • http://tokipobobanokab.rf.gd/jizat.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/avg_antivirus_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/voiced_and_voiceless_sounds_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/foxulejusokububij.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/chemistry_summary_notes_form_1.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/wusakosijipojagi.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/pioneer_corn_growing_guide.pdfIn PDF document text
    • http://jewezoku.epizy.com/rulupusuxivumarijut.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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 4904 bytes
SHA-256: 8d71a472a0e1874d8d004c059f31a9aabf399044385a8f9ad1b32bb6b8b1a31b
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 11184 bytes
SHA-256: 8ab6dbaf1989f40ed39928b00b32253826f226740516af745e9442077661a24a

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