Malicious PDF — malware analysis report

Static analysis result for SHA-256 720e1c6d877a8b78…

MALICIOUS

PDF

77.2 KB Created: 2021-03-31 02:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7fb73cecd393a9ab4d71fa67085c1825 SHA-1: 7e5dff6533ce340abc578dd25aaeb7199f4cc52f SHA-256: 720e1c6d877a8b78c7609135153f298eba16bc7eaeb4f98b4b0124ffaa1f2afc
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 phishing attempt. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting a targeted phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=errol+morris+believing+is+seeing+pdf PDF link annotation
    • http://mebelrostov.ru/planes_y_programas_de_secundaria_matematicas_tercer_grado_2011yns41.pdfIn PDF document text
    • http://torchqbfl.fun/adverbs_worksheet_circling_part_1_answer_keyf9qta.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/bqpHTV8/who_infographics_breastfeeding.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/fSiiHjd/bebuwewez.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/djfFZhj/how_to_recover_my_old_whatsapp_photos.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/bI7hhMI/play_animal_jam_online_login_page.pdfIn PDF document text
    • http://bravos-kids.ru/big_little_lies_season_2_episode_1_full_online_freecpm55.pdfIn PDF document text
    • https://cdn.sqhk.co/buzusodova/VdWz8cZ/difference_between_unknown_caller_and_private_number.pdfIn PDF document text
    • http://housefashion.ru/tevunosonesadi4gerg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22c38ac-ad92-4809-bbed-b4f1b38c1b92/89453954645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc68c29b-3087-45f2-b85a-9bcb41262ff1/letra_y_explicacion_del_himno_nacional_de_honduras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4469485-7ea1-4019-b5ca-5436438a61d5/85804302604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba8a8ea-c385-4532-941a-5461b5b0676a/89196479148.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/81125282840.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/applied_multivariate_statistical_analysis_johnson_wichern.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/risk_assessment_software_template.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/sundance_spa_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acebbd9-d934-49f3-98cd-b525c8520287/2014_yfz_450_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af2a19f-936c-431b-851f-b8f16e30fa52/57227456409.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/95054195807.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/42341710214.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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 5308 bytes
SHA-256: cc3c1eba11d98fcf3234e622a1bed3498ec527c0c1b01c201068e786e6c1768f
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10432 bytes
SHA-256: e984e9daa0d36537e7e7fb1d6d82e856a6bb69cb46c7838d39b1386639f4eb50

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