Malicious PDF — malware analysis report

Static analysis result for SHA-256 950717baa67262f1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 20:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5e13c57bb6d188660b3e4a1f7f40a23 SHA-1: 81463dad257cc3a83e9420ca92273c94f940e916 SHA-256: 950717baa67262f1d6ba12290ab608508608c13136c390079e9d1eaabee94075
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document is designed to redirect users to potentially malicious or phishing sites. The ML_NYX_PDF_MALICIOUS score of 0.995125 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://skidubravy.sk/spravca/ckfinder/userfiles/files/fetefuboneviguwe.pdf In PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/36537084096.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613091dd4993f---64148116989.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/26391331532.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/weviwofodosirodud.pdfIn PDF document text
    • http://hanauhrova.cz/files/nijusufikiwotowoxawabafe.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/92751377985.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109130721423372.pdfIn PDF document text
    • https://architektor.ru/uploads/file/kujejubuzerinagaraf.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/77134351106.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/gigivur.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/64045599100.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/zenogukoganiwa.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/8277328096.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/sabifidowosifeluxenese.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/33362049567.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/17158237843.pdfIn PDF document text
    • https://campermagazine.tv/public/file/61005008901.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/93744310324.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/gavuvokezeratow.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/28859252188.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jagewomutif.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/67811699641.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28340861307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=braiding+shop+near+me+openPDF 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_off0000b48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 15576 bytes
SHA-256: 5e888f358cda3e07f59a353239872576764b53518853e4b6a06434716cd897bb
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10748 bytes
SHA-256: c94b6574a47540ec4fd03d28a14b3440762cc94a17fd0eb8299f1dedde3ee247