Malicious PDF — malware analysis report

Static analysis result for SHA-256 e853bb3f54f73a8a…

MALICIOUS

PDF

85.3 KB Created: 2021-10-06 15:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51cedc795f4e7f7ed3d664af9f2b6cb9 SHA-1: 74deb6d3f1d11f335ee09677d30e7435ee01d2c6 SHA-256: e853bb3f54f73a8aa1baab9d2fa0c610db37d5f066625a6d26614c93f70314ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://chcial.ru/uplcv?utm_term=cryptography+and+network+security+5th+edition+solutions+manual PDF link annotation
    • http://atel-j.nl/uploads/files/wajokumases.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/42630163277.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pinarinova.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/mirusevewugisi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/wemevoluxujixekugoporoxap.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/66234428002.pdfIn PDF document text
    • http://lactopad.com/uploads/files/wuwefoxibekavurofibure.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/90915821350.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/nalasuwisexilotev.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51726019374.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/2892490818.pdfIn PDF document text
    • http://co-mit.com/uploads/files/97333436774.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/xozaniminasavibumos.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tosadujelu.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/vovixiz.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/92775959807.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed6a570d---pefumawavor.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/61883058509.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/levalodesinu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090312123728.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/rukogap.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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 11516 bytes
SHA-256: 1839950ddb7fbf196d50bd8e59852d0dff076a3a3873f5b23a174dd850e0af28
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 19512 bytes
SHA-256: fe9d03c290e1e58ac5c5f37ea3c340722dab620abf768fedfa6c9a98079d2e76

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