Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8065d8bf5f6c9b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 09:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 15d6cad2ffb4255f00280504647cfb96 SHA-1: 5c5ea4d0a15665a179c7a8f8760274576032864f SHA-256: 1d8065d8bf5f6c9b1a1da84172deff3621e76ec7e7acec854efab7f363e64bd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://ratchadatitan.com/UserFiles/File/2916635176.pdf In PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/8115991880.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/sezokamegifiziletixuf.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/6172810315.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/kawevifa.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/49973098285.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/66918596078.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/zuvijusut.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6726475514.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/82466417511.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vovagopawarenexojima.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/57646941559.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dikojexasetolav.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/24416411882.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109162009229002.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/mimageluwujefekidi.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/46430957580.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/kakiwabaxejajem.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sapolanizu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/661ef9147ef9afd26e11aada3619deac/74234830521.pdfIn PDF document text
    • http://dgkno.cn/upload/22229365449.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/17864571189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=streaming+prison+break+season+3PDF 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_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 11028 bytes
SHA-256: d3cc559db4f056312be7a90ab5a124d08b6a230525e7f11fa8b6beb6bffbffe7
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 18056 bytes
SHA-256: 6b198fd3efd3c4782b9c3246790c8243bcbd60cd77613ece2e40d539c7c5b019
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1