Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e9785c36759f34…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 07:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00dac4b97339a1c0ce7afadcf7fb036e SHA-1: 236d98c2c7cf0e27df4d0e17ca5b60bd290e5781 SHA-256: d4e9785c36759f34be038bbd42c45a55c4969b513afdf8939e8fc8b9fe611634
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crysiq.ru/uplcv?utm_term=how+do+i+activate+gps+on+my+phone PDF link annotation
    • https://advance-pack.com/editor_upload/file/repufedoga.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/jebipig.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fuzidivaduw.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/52651070093.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/desumelevatam.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/zazutifudafilituzofejudu.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/teranukezosodefogu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pivikabirudixitanapumu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/pinorafevojevadonufuluja.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/xadiguxojag.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/jeferubibubavaxovizute.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/94554597897.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/pufabuzozedimujabev.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210917125511.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///kugemanijenedugofedexeja.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0p3oaba5dsnpi1uccpp7vvb7m1/56402655552.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/bejeduvit.pdfIn PDF document text
    • http://pensiunea-escape.ro/ckfinder/userfiles/files/510139940.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/deximiriribinatelifiku.pdfIn PDF document text
    • http://chromavials.com/d/files/4376681185.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/20580477889.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613199b66e317---telemenula.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/dusotofem.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/83210262485.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 16904 bytes
SHA-256: ccedb6ebb937ff1a2ef0edfb475a4d2e190dab51938fca32fb9ac2f2b8bab73d
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 11072 bytes
SHA-256: 6ea3c0b9ba23805198e7b4fe4d3c145b74d6516c1f88e7be1eb862479f4db3d3
font_02_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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