Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b1c5e206389cf4…

MALICIOUS

PDF

82.4 KB Created: 2021-01-25 16:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1dfa5f90a44c9014ee81af440e166e26 SHA-1: 9758b5550c8c317b144bdf642b319977d79d7617 SHA-256: d4b1c5e206389cf4f5f177b52c7f36854472a9334b891dbb7ccabe3e35097600
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it's designed to redirect users to potentially harmful content.

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://seumenha.ru/123?utm_term=disjoint+set+data+structure+implementation PDF link annotation
    • https://cdn.sqhk.co/bidogefapo/EH4Jjc8/xekum.pdfIn PDF document text
    • http://discount50.pro/hd_video_downloader_apk_free_download4uge6.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/JgesXra/photo_video_maker_slideshow_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/g5Mhjgh/online_games_free_to_play_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/jhnXjc6/37165902131.pdfIn PDF document text
    • http://slampochka.ru/oklahoma_unemployment_benefits_numberul1zj.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jDwigig/60700662847.pdfIn PDF document text
    • http://stavki-na-sport.site/760_horizon_drive_grand_junction_cotzhae.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/egcwNgf/kunivesedimerudejuzudorej.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/wowesukox.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/ghjbghI/snake_candy_io_hack_mod_apk.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/jefobexapulow/abc_song_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/income_tax_return_form_business_profession.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/33314699250.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_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 5292 bytes
SHA-256: a994d60ffdcc30f6c9c65da0225a308dd6d770d0cbd568342c4e680e88d51dd4
font_01_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 10544 bytes
SHA-256: ad5905bce50e1c4d4773429564fdc03e021576475dbf4ae3a9979bf56a7a1135

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