Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28dc43ec7cae982…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 10:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0045d4b4fc7652d309676da78818d9c8 SHA-1: a52f378596e6c23520b7b5d29b4c32b068d07dcf SHA-256: d28dc43ec7cae982437708d0e992f3a7a704dc263c3b6334a63af3d612eca2b4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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.
  • 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://pistant.ru/uplcv?utm_term=radio+nz+app+android PDF link annotation
    • http://www.farmaciapenil.es/userfiles/files/basoribadot.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/77664470309.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f7bb66c9---zevaxili.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/922813406.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/jojiwateb.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mifabod.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lugisid.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/8650932121.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/gilarejaruvaxelaben.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/19437781300.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/favumo.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/fejegodorebat.pdfIn PDF document text
    • https://iohrp.org/f_files/files/11561394754.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/zolep.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37161663607.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/katufeguj.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/47783186012.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/waxujitafisanigopiro.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/59073277347.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/74688863159.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/mefaxowodafubitizofej.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c64c93f9a---zubekabetikisu.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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 17560 bytes
SHA-256: f20c9038a04c8af008e26cd14fa3b85cb311338ea91262b421c37fc3fba9da13
font_02_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10044 bytes
SHA-256: 6a4e2916dcf62879f738020d6e839bfe46193fe2c563211cd824ecf7eb732c37

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