Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47d3fb5dcebddfc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-29 20:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8e56d18a155960c5fe3f865151a5ed7b SHA-1: c416b940fa2ee77c5d952e50e8595f681e51ea84 SHA-256: a47d3fb5dcebddfc8fd5943193c47e788485d4993fa5e1f7c37bcadfe2ffc2e0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'https://seumenha.ru/wix?keyword=nc+math+1', suggesting a phishing or content-luring attack pattern. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' further supports the idea that the document is designed to redirect users to a large number of external resources.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=nc+math+1 PDF link annotation
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/7972403.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/hih0Njh/54868793273.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/4Tu8hfs/14466560723.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/Egjevha/candlepin_bowling_in_western_massachusetts.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/2d7607f725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixupokolaxusuv.epizy.com/postman_api_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/subtracting_decimals_worksheet_year_4.pdfIn PDF document text
    • http://zujuwijiw.epizy.com/visual_basic_code_generator_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379e9293-2920-419a-8b85-4aa030b7567b/fasofatevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769ccab2-9e8c-49e3-b9eb-a287bd77fdde/ea_sports_ufc_3_pc_download_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/30483439483.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/40718816117.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/18479826982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c6998b-114b-4b2c-9207-fbbdf61bfa1a/51098428987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5a862d-f429-4aca-ba3d-df36b9c7cec1/aprendizaje_basado_en_proyectos_ejemplos_matematicas_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3d4ada-9bb3-40a8-8e04-da301ff82a15/e2_weight_distribution_hitch_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/flash_tool_brom_error_s_ft__fail_4008.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_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 4752 bytes
SHA-256: 439ccf652be3d49aa32892c7715c3a6b8604fa38e4ca47d26fd95d60274b258c
font_01_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 10692 bytes
SHA-256: 758f513b98cd400055b71d8ff04d86daec5fb31d4b8c7cb53870f03f2e153566

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