Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe6c23907131432…

MALICIOUS

PDF

79.4 KB Created: 2021-03-06 12:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 019715a7b5b2b0a67c2f82d3f440ad2e SHA-1: e4e991611dd9835cdc6fe0eeea8a6d2919b00f4c SHA-256: bfe6c23907131432590b0868a6ba351da849c95db4867d77d27c2afd2e5b2c09
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 as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a phishing page or download a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=rrb+je+cbt+1+book+pdf+free+download PDF link annotation
    • http://roxopazin.iblogger.org/fulenuxek.pdfIn PDF document text
    • http://xozivupanivos.22web.org/24073517202.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/compound_sentences_worksheet_4th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/ccna_1_chapter_1_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/mopufupomisavibisozisu.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/vexonalorexej.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/fossil_q_explorist_gen_4_display_smartwatch_ftw4011_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44603454-203d-4efd-9200-6d9715b5b852/73082312754.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/roofing_contract_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/graphic_design_agency_website_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/8856380620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a795116-cd1d-4f07-9db4-89036bdedcbe/old_skool_vans_blue_fog.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/picsart_apk_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/duke_nukem_3d_megaton_edition_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/28784556034.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/brunnstrom_approach_techniques.pdfIn PDF document text
    • http://soxomidil.epizy.com/94849155003.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/apa_format_bibliography_multiple_authors.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 5404 bytes
SHA-256: 8be7cacc380d7a0fc3ca06c2bf9dfd6163fdb620cb6c8de7f090d8290718b682
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 11680 bytes
SHA-256: 44caf4841bb813e74f2f441c700b0d1a4f03311afae6ca28d698ced34718b44c
font_02_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 7664 bytes
SHA-256: 4621921aa1662238972cfea46c2d6fa0b483a9490199373eebc3bc83832c5d72

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