Malicious PDF — malware analysis report

Static analysis result for SHA-256 72163a6be742ac7c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 09:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fad2ede93526f23ebcdbe10a16c319f SHA-1: 31f413b90d31df32b4c4b66ab727c70048afcb00 SHA-256: 72163a6be742ac7c4a994b00cbd80ecaa36bb2d2505696f6f35c29081758222a
134 Risk Score

Malware Insights

MITRE ATT&CK
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 PDF also acts as a link farm, directing users to numerous external URLs, many of which are suspicious and likely serve as landing pages for phishing or malware delivery. The presence of embedded JavaScript and numerous external links strongly suggests an intent to exploit the user's browser or trick them into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bomando.bomsolar.com/uploadfiles/files/28239690656.pdf In PDF document text
    • http://uitetenindex.nl/images/uploads/xulivawogipepikuda.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/xuxonarenakokufuteb.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-9/20210909223017387820.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a904165b8---zabozazowogow.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/91807708899.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/fotubuvabexuvopapipudavum.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/3433972195.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/jefojifutesafe.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/finixagaz.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/posevapozumakepa.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/77197684380.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130179890fe4---32667801577.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zakudurididaku.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nimonaba.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/supirasen.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/36063718803.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/wevaziz.pdfIn PDF document text
    • http://anm-av.de/uploads/files/xadibapexakuxoxulitakopi.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/81701217854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+boot+loaderPDF 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_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 10192 bytes
SHA-256: 8f2fc22463b3d6bdcc1204c19445630a72d304b3a7833e96a98a1d0c4b01bf65
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 17716 bytes
SHA-256: 7b56bc314431ee70e2ed4500f8c8cb43b98fdc29e01721027cb79b5a4544eb4f
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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