Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dde2ac42e7a2e8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 11:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1416eef6b63765c140ecd0d335738e88 SHA-1: 6559786996b503a0b1568ddeb85e3a2b56d9cb3e SHA-256: 31dde2ac42e7a2e8373700bf9365a565e31d7a6f05882824bbdf01326bac6820
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The presence of numerous external links, many pointing to disposable domains, and a heuristic firing for a 'download button' lure suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://labuchedeberce.fr/userfiles/file/3327680877.pdf In PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/42888155852.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gotave.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58e2dc096---gerokovemutij.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nifoliboxubojavudomexij.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/zivaxajudo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/7467850798.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/50353688711.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wogivivesonagogoberazagi.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/81908816251.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/vekobeki.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/lodaranenesanowi.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kujunonip.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145313157dfa---pinonebudonubofubotubavik.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jadajugubex.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sopixukiti.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/mesurevedobasikokebunex.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/ratusipisupow.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/19424386306134f0c2d938a.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/32725707480.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/36093758473.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109111006583796.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/mumeremaku.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/5270473300.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/robameta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=virtualbox+android+image+downloadPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 17980 bytes
SHA-256: 87abb21a5fb275ac0769e328949a49e9a4bf69f860784787fbe661064c59c46d
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10820 bytes
SHA-256: c63cb7e26a9caab2c3bd6a1c3aac9329bd33da91c729526e478d95bd61640af4
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1