Malicious PDF — malware analysis report

Static analysis result for SHA-256 3653da298c02926c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 16:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 444686a4bb6b59d579070451bad9e5c1 SHA-1: 560778909213acd254ca4f6f41c7d87774b629a5 SHA-256: 3653da298c02926cf616844dcbbe1d86a607d7835cd5e86bc18009032b160846
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs pointing to disposable domains, indicating a link farm likely used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sjmhospital.org/files/js/ckfinder/userfiles/files/51031077556.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/33661433089.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/66062328130.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/81001227088.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/8526507319.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/29071191469.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/19205713666.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/53862769062.pdfIn PDF document text
    • http://idroter.org/userfiles/files/wosovapukonofolul.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/19326710427.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kifef.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/80858631856.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/vedijuvobodukis.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/voxarowipudalaruxi.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/48016685164.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/wetobegelaf.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/95919377990.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/77719212073.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388b154bc62---21864643328.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vupakutexunuwiwezedo.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/manemufadagereda.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf9d53808---zujenenewuderifalez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=space+truss+buildingPDF 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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 18468 bytes
SHA-256: 97b86232535bd4dedd34f3d5e5d1c98e914197110b850e75e0995ee9f1d7b3fa
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 10884 bytes
SHA-256: f5de428792769a4ad2e47b11f9b0bed44db7601452a83bdfe3c63ae02a04f786

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