Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1b51cfabfd74e5…

MALICIOUS

PDF

88.7 KB Created: 2021-09-10 05:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0b5c9bb0e441dcafb68505f002a3985c SHA-1: a660efe332a0c40d5168169c8f76ab0a456156db SHA-256: 4e1b51cfabfd74e5d580a9f1b70aeb45df32c1473dac29d05e93b46bf376a511
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://pi-consulting.ch/download/33329139279.pdf In PDF document text
    • http://rubivina.com/Images_upload/files/62183459749.pdfIn PDF document text
    • http://t-groupvnxkld.com/uploads/news_file/wudejazelonilosotu.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/bawopetidok.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jowovelulagalivose.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/texedimudozizisadivo.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jevipigataguzorapu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/7121957315.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/56468973472.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/batiboguxoferakumuzu.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gogazalofitozapivi.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/99914599853.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/9458362982.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/papebekola.pdfIn PDF document text
    • http://portableandcool.com/files/files/fizetolo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ffa4ea6---17287850103.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/voxemezexaw.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dacb28213---zaxubanites.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/ranipefugalabi.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/86607006648.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41641516935.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/77460826236.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/13901442041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+adblocker+for+chrome+androidPDF 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_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 17960 bytes
SHA-256: 2afb912e53938b0b624d432f1e9bc3ea2123de1a8507616da0855e9f1018f782
font_01_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 11024 bytes
SHA-256: aff884c1101f2906673419af41d39296a23f9dce5c78fc5a633d94dcea90c684
font_02_sfnt_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1