Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8afe5759498d9fe…

MALICIOUS

PDF

68.3 KB Created: 2021-02-15 19:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 109f26afbcbcd59394b62c893a19ffe0 SHA-1: 897de5b20a8858d1e60e144c127de8b1b0f1b603 SHA-256: b8afe5759498d9fea682a4ee22f8bb68daf0e386228dab6515a44fe7fa96979f
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 leading to a suspicious domain. The document body, though heavily obfuscated, appears to be a lure related to a mathematical question. The presence of the PDF_URI heuristic and the ML_NYX_PDF_MALICIOUS classification strongly indicate malicious intent, likely to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+would+you+write+30+over+100+in+decimal+form PDF link annotation
    • http://baby-slings.ru/pejobusokowenotediwsxc9u.pdfIn PDF document text
    • http://jozarizotugi.22web.org/cotton_bed_sheet_flipkart.pdfIn PDF document text
    • http://contact-git.top/piwelunuwujuloba5qehr.pdfIn PDF document text
    • http://timogefubor.22web.org/spotify_on_apple_watch.pdfIn PDF document text
    • http://opt05.ru/pelojxcukb.pdfIn PDF document text
    • http://firstflirts.site/luxuwumevodew4zyg2.pdfIn PDF document text
    • http://stc-l.ru/wojojexu3uut.pdfIn PDF document text
    • http://doordash.link/zibimebidarabind8wc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gopifu/aci_diploma_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/rabudoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/54385715918.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/faporowitib.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/information_literacy_means_in_english.pdfIn PDF document text
    • http://tolimimagag.epizy.com/tudoxutujeje.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/avatar_icon_for_android_png.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/95377237028.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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 5560 bytes
SHA-256: c77ca448922459f994541d31ac40f25242c5e22f414834c287b525c4cd71a0c0
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 10376 bytes
SHA-256: 7ea51b6570178578d9862e4e7702409f35e8b75a857ef69cb4b1fe51f4de8d3b

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