Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10b3146189d67eb…

MALICIOUS

PDF

83.4 KB Created: 2021-04-05 13:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9828f208fa88bbfaf47bd3570455e91a SHA-1: e23d95ced9b3ea78fe324be0629d323e6b1b9608 SHA-256: d10b3146189d67eb0f02bb13cbe0c100703fa7f4608920f42366bc6df03de461
96 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is identified as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Linux administrator interview questions and answers'. The presence of external URIs and the ML classifier's high confidence score indicate a phishing attempt. No scripts were extracted, but the PDF structure itself facilitated the malicious URL delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=linux+administrator+interview+questions+and+answers PDF link annotation
    • http://fodekofuxuvum.sportsontheweb.net/miwazazesezosavabuxuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_5fd8765a17f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5fde4a680d9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_6054477288e1e.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/80349717045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_605678691be73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5ff290165df9a.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/tuxexi/49297973098.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/tswr_jc_cet_2019_results.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/46825501034.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/zulisulopifexeziw.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/glacier_bay_water_dispenser_hot_water_button_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/93081462325.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/argos_fitted_bed_sheets_king_size.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/6706390605.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/french_pronunciation_guide_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/que_son_los_pronombres_relativos_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aeeaca0-3474-45c2-aa57-ad5c0a02912c/35888095672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704224ac-38b1-4c66-aaf2-82070f5365c7/39780733042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce2580d-84da-48a6-860b-0f6c1d7678f8/vista_20p_installer_code_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/sizedev.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_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 5224 bytes
SHA-256: 982e708929140c1f200533fe884ac9c4a4fe01e1e14d304a339a4f1651b6ccbf
font_01_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 10584 bytes
SHA-256: 13610bc873984245dfd080ef5e946ae49e0aef4274bf391c0618828c37e554e4

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