Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe37c5729728e2f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 01:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 207aa6e56c071078b1ffe4a6d80832ed SHA-1: 407bb1e8f8a9378c88162e15f2af2b02e44dce46 SHA-256: dfe37c5729728e2f5f635cee9ed21872bf10bcbf68c13587130458e710403f72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of a link farm with numerous embedded URLs suggests an attempt to redirect users to malicious sites for further exploitation. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://hkfew.org.hk/ckfinder/userfiles/files/risejadufedodobere.pdf In PDF document text
    • http://textingrights.com/userfiles/files/resofibof.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kanilelaxepafomexigen.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/podebeliralilup.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/sitavojewesetasikokalove.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/wufojaxolirazumurozubisos.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zifugufomumilavew.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/sexoti.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161419b34e6910---kidelizabuledakorifijuvo.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/78182983319.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/tujebanakepenezizego.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/74669952884.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/20473638699.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/11037664743.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/64696241470.pdfIn PDF document text
    • http://anindecor.pl/files/file/folajosurewu.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/90990384703.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/demomamutaxufideliwolumot.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/42672907490.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j0e2sjvsjcrt14nv122doej272/87068008730.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909092140.pdfIn PDF document text
    • https://funke.be/data/file/35325747724.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/83095334072.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/64250985582.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/98595484332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+friends+moviePDF link annotation
    • 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_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10752 bytes
SHA-256: 4224701f9db4f902cebf471fba836a334fde8fb685ea394dd9175e72b452253a
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 17596 bytes
SHA-256: ac536271c7513e08b7b00190294c2f3d64a9a76403bc89340625c46610a258b3

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