Malicious PDF — malware analysis report

Static analysis result for SHA-256 c390dbfb59d54ba3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13173c5e82e0664b9cea308de47dad0c SHA-1: 3b5475b806ba90c8787a20a3d6638b78bdc5e755 SHA-256: c390dbfb59d54ba397c9453d25935f528a3cdb76e704d4d8027b6878c56f66bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or potentially disposable. The presence of embedded URLs and the PDF's structure suggest an attempt to trick users into visiting these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://njchemland.com/upload/files/59081032400.pdf In PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/64838127758.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/29406577646.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/64854054856.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/60648102684.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/narunosafovibavobipaw.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631834312.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/85667791512.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/voxetas.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bovezikawedopilib.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/risazub.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62688966746.pdfIn PDF document text
    • https://mauspro.net/upload/files/jolupezezexukojatob.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kuxadapome.pdfIn PDF document text
    • http://snsi.jp/image/news_file/53705886198.pdfIn PDF document text
    • https://onecre.com/images/content/files/19570560103.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/43059246073.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/4798391035.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109110149245540.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/sapoxazovakadeludajedo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ad6ad96579556f5b16ec69193168a1af/ligovowomofo.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/gisujulitiwisoj.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mivanezeluv.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/12624186873.pdfIn PDF document text
    • http://101balkon.ru/upload/files/327590893.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/pelasedizasenom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bigg+boss+14+watch+online+freePDF 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 18348 bytes
SHA-256: cc67c3d909e68bf110a204c8f76475056629ea96bf1ec9d527a6b0a91fe81706
font_01_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 11024 bytes
SHA-256: 9783b7e0153041ebcab22e0c5c4e28eca20cdb85c54f3cdea4096c96226db409

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