Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d1e4659c251886…

MALICIOUS

PDF

81.0 KB Created: 2021-03-20 11:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56d4e7898151e8d864301b90322526b1 SHA-1: d604076eeee3ab80e515bb6ba1f548c16d773427 SHA-256: 46d1e4659c251886477c1429b438592982f53762a6828cc1e7cdb69244d6f7b9
104 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains embedded JavaScript and multiple external URLs, one of which is `https://kuzutuzo.ru/award?keyword=online+advertising+project+pdf`. The embedded JavaScript and the nature of the URLs suggest an attempt to trick the user into downloading a malicious payload, likely for phishing purposes.

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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kuzutuzo.ru/award?keyword=online+advertising+project+pdf
    • http://sudidukof.22web.org/68700415527.pdf
    • http://chambrehub.xyz/gutuboguj1i2b.pdf
    • http://nuxokavarop.22web.org/guide_to_data_analysis_using_spss.pdf
    • http://besemafobekilir.22web.org/tekopozitunifewamabedapi.pdf
    • https://cdn.sqhk.co/vulovosovem/sjjqPja/free_gems_coc_in_2_minutes.pdf
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fe25327d2d06.pdf
    • https://cdn.sqhk.co/pigexebobe/giWjaoD/82655156598.pdf
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fe6717d710c2.pdf
    • https://cdn.sqhk.co/dawolesirip/hjZjbhe/australian_blues_music_festival_2020.pdf
    • https://cdn.sqhk.co/fasisela/ehdichd/40154389537.pdf
    • http://sdfafq.info/what_size_screws_to_mount_vizio_tvjdew9.pdf
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fef99ca9dd75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_cde618db6fcc498c815a4683bfa88ce7.pdf?index=true
    • http://nidomovux.epizy.com/how_much_do_starbucks_workers_make_in_california.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/kellogg_one_year_mba_employment_report.pdf
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_a0c17836f6be4d96b4944321c157cd62.pdf?index=true
    • https://s3.amazonaws.com/besafefaf/example_paper_apa_style_6th_edition.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_fa9c84cab88246ff8d19d17825f73c88.pdf?index=true
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_38e9a85dd0f14155a4cf7dafec3654c9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe13.bin
48ee26d7ac5ad74ee0bcfc72178d6fd7e936d9620af2154e8650f2d74a19d9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 5484 bytes
font_01_sfnt_off000110d9.bin
29a2c56a21b2710120d822321e477873f2d03af6c3abd6469350496d1caaad94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 11172 bytes

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