Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1eb28116a02a80d…

MALICIOUS

PDF

73.0 KB Created: 2021-03-22 15:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2f90bd77b2f10920ed4d1528b41aaad9 SHA-1: c021a5476392f8b10f21653d5ede81c8ba0439ea SHA-256: a1eb28116a02a80d2a2fa0ea2353ffb1de7515ee0a04cad3d76abf84ed228b90
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL likely leads to a phishing or malware distribution site, disguised as a worksheet answer key. No scripts were extracted, but the PDF structure and embedded URL are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=accompanies+geometry+in+floral+design+student+worksheet+answers PDF link annotation
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/3e3763bdfe0125.pdfIn PDF document text
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/1149096.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/c065301c8fe570e.pdfIn PDF document text
    • http://tadunikij.22web.org/27828750698.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/13d175b4e.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/ae6d4d15e60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vominobig.rf.gd/27929381392.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/pearson_6th_grade_math_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/vooraf_ingevulde_aangifte_opnieuw_en.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/excel_compatible_spreadsheet_for_android.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/tlcharger_whatsapp_apk_nouvelle_version_2018.pdfIn PDF document text
    • http://geboxazuwem.rf.gd/pdf_to_access_database_converter_online.pdfIn PDF document text
    • http://kadanokadija.epizy.com/22938634422.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/corrugated_metal_roofing_sheets_home_depot.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/what_does_the_raven_mean_by_nevermore.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/11045484412.pdfIn PDF document text
    • http://gafijid.atwebpages.com/71143693269.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/bthusb._sys_driver.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/49047306732.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/dementia_research_paper.pdfIn PDF document text
    • http://vetanafajodomek.epizy.com/80507287834.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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 5696 bytes
SHA-256: 8b0ee546df48458ef08d92bd3ede6fc2e4c39eb1cf4e9d5c2d451502d0d94cab
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 10480 bytes
SHA-256: 7e1c46f8cf0c42c900db83a5251613e03b68cd33fb45780454ad9ba95a5cade0
font_02_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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