Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fa406e4a3177e5…

MALICIOUS

PDF

75.2 KB Created: 2021-05-04 10:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f7fa26da1915a553951c59716f53bb4 SHA-1: b34c116058f0c99736c2cceacdc3d6ff37dd6f38 SHA-256: 28fa406e4a3177e5c77a66c8c230e4cf17cbea4caf72f3a195b6a0bc9e204413
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that uses social engineering to trick the user into installing a browser extension or update, a common tactic for malware delivery. The ML classifier strongly indicates maliciousness. The embedded URL points to a suspicious domain, likely serving as a download or redirection point for a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/strik?utm_term=microsoft+word+table+of+contents+align+page+numbers PDF link annotation
    • http://kurudapod.medianewsonline.com/automated_trading_with_r.pdfIn PDF document text
    • http://tazanup.mypressonline.com/excel_data_analysis_tool.pdfIn PDF document text
    • http://astropsychology.website/latest_version_of_chrome_for_ipad16e6t.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdfIn PDF document text
    • http://pressit.space/how_to_program_a_xfinity_remote_to_a_sanyo_tvyxi44.pdfIn PDF document text
    • http://idealsit.space/appraisal_comments_for_exceptional_performanceltxou.pdfIn PDF document text
    • http://vizit.store/cant_access_wd_my_cloud_dashboard0neld.pdfIn PDF document text
    • http://nuverlites.online/49460480677tn4q4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/lubapunoboguzemiwazak.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/cherrim_different_forms_pokemon_go.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/nifixafupuzaguz.pdfIn PDF document text
    • http://noxukimu.myartsonline.com/frecuencia_cardiaca_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fbb7a1-4c1e-4c02-8872-ba4bb85b2e6c/20838402442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91710d7-50c0-4809-bcb4-afddcf22a145/gizuvaropavuxuveba.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/75334275216.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/bearing_damage.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/vijitukolodesilanurezafe.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/lotezasajovu.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/skeleton_crew_stephen_king.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5712 bytes
SHA-256: ce218851bb33ecb20cffac55d6ef87cea03333ba970c9b4a666f34ab81793eb4
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10976 bytes
SHA-256: 7c5835216f4d90c2c3fc43fb4ef11b8b6d7e41da417eb19dcafb976b3b05c2d8

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