Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbd23986dbe35f5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 02:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d991a82c7279346dd4de8024c76f5db9 SHA-1: d66e8cd1a6b8c40e16bc8f03c2560fcbec33bd02 SHA-256: edbd23986dbe35f50efac21ad65a94cf88692c9b0e5f8de9cb4c6ec6393894b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are typical of phishing lures designed to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sbsedupatti.com/sbsedupatti/userfiles/file/fedezisidedusabenimuja.pdf In PDF document text
    • http://hzqzg.com/d/files/kutidoto.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/59573179147.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/56865730739.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/36687927337.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/numoruw.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/dajaluxilatax.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/85093271453.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109042313166500.pdfIn PDF document text
    • https://telorgabus.com/contents/files/vimupa.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/buzivakupopepone.pdfIn PDF document text
    • http://househouse.it/userfiles/files/46041881982.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/waxovufudagisu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/rakuvej.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/noginoxame.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/sobonesibixagutar.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921312286909.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/84977554076.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f687500e4---kelasimupazusu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/fililanajodixunofiw.pdfIn PDF document text
    • http://faradbox.pl/files/file/58073873660.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/jepuzivumojivopimezazave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sdorica+puzzle+%26+tactical+rpgPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 17988 bytes
SHA-256: db45a8e79b832081f82915773e48c3ef8b1ca95314c361859d5eb159615d151d
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10372 bytes
SHA-256: 89559a841c70fc2f875a28cae5ef2ed2a638ba7c63eac76bdb511f5642880463

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