Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcd3cc90a058a7a…

MALICIOUS

PDF

71.5 KB Created: 2021-10-09 03:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: fe5ce895e7a0cc0ec70615b30fa0d4e9 SHA-1: f23b67f1c065acb9e944dffc92b6b3f70d4654c7 SHA-256: cdcd3cc90a058a7a858b0dc280fdcdb2b3cfa7b689be45253dc82bb4b2385220
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=decomposition+of+h2o2+is+accelerated+by PDF link annotation
    • https://kamionosnyelvlecke.hu/userfiles/file/49222110560.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wivevipofadoginix.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/76037963501.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/sesanafovadonupogimutija.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xisozalenajedan.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/37846461757.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/xonazafopamuruwule.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/88893e97c06cbcf59ce2b203ceed3e03/59724831845.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/39827242668.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/kojufipibamegonuruzener.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/bekebijepa.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53032661003.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/misimipiv.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/xazuwemumegebaxeseku.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/58816838033.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/31541597807.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1615d38fe410d8---41927968754.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/riwibezuvinuwaxexaba.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/40465909416.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/newesibotalibagopoveropat.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 17204 bytes
SHA-256: e5b972215766044e2b29a0ac6c0539a2d8608cc9818fd980d3a8435c5a670ba1
font_01_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 11260 bytes
SHA-256: 0cbb1ebd03a47e0fde71639b2317bd136976b45b4c95269d946bbbd1e4fb827b
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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