Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23e26d88f272346…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 18:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83cf806c9fb9f5098450a5b824b5ee80 SHA-1: e3b12134c8f7d297d0d14c3124bbb494190d4669 SHA-256: e23e26d88f2723465ed1751485013359a6cd1ac25fdd93e158ec256550dd7188
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based 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 0.9974

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laconchigliacasevacanze.it/userfiles/files/bobegebogagaxepawig.pdf In PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/feliwegofop.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109091111191354.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/jijefukukigifitok.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4eefb99bad15e9c7240ccdeb28e27953/7284331325.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/90246973871.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/38517440606.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/78335295132.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051411292111.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/fupifegelirokoja.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/lizirujozitivamapukogoku.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/vurilibezutawekemobuguvo.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/denusutovenejedax.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/dekenilefogumifana.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/93890055211.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/61762428385.pdfIn PDF document text
    • https://2winit.com/Files/files/61807883670.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/vurerefol.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/pezigubexinejepu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9fc8883f---72181285575.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/73672470292.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/julinikogewit.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/63124010753.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/kevojoneligelugoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=party+miley+cyrus+lyricsPDF 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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 19308 bytes
SHA-256: 54050136feb4406e37b983aef6587d882ab23688e9609b6d0993cae4e3d13839
font_01_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 10384 bytes
SHA-256: 76e2c664248e39ff9414c414e4a31846a5f51006b6d20165aaf1ab60bf521cf4
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1