Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cba6eb6e1657a3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 08:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a488f2ca89878339dfd80064a6850ea SHA-1: 2e7d6bcbd2be1aba24c7145c10a520188eef2bdb SHA-256: b7cba6eb6e1657a3a3ee4d4c8e1a5c496d1ebe5f0925617f4e9245454fef7aac
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF that exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic and the presence of numerous external URLs, many of which are likely part of a link farm designed to redirect users to malicious sites. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic also indicates that the document may attempt to trick users into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=chromecast+extension+for+mobile+chrome+browser PDF link annotation
    • http://analhospital.net/file/files/mepikaninimebagav.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210902022604.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5bfe76da1---53750403530.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1b9ed318---rirafusenunezisotu.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/11122324668.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210914033059.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/76672254985.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rozunepoxa.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/lubosajibiv.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/zupofuwapabituxogudazuw.pdfIn PDF document text
    • http://progetec.org/userfiles/files/lukesetejoluse.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/56058726709.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/62511617829.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/bogemuliduromujesibu.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tubeluvuvipibema.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/85552180003.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/93501435184.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/fenigajezadanizej.pdfIn PDF document text
    • https://cargotavio.ru/files/file/5493795223.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/40412606861.pdfIn PDF document text
    • http://darstin.com/userfiles/files/kodarabawepezot.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_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 17296 bytes
SHA-256: 18c23ebff69ba69010c631fa453e6c53e382c7a50506884c1dfa614bd1ec4a19
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10960 bytes
SHA-256: 4e330243ea289af81cdc9e9fadbf491dbed375f3b87461710f166d26c1dd8ca7