Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdceaf3f07bf1805…

MALICIOUS

PDF

72.3 KB Created: 2021-10-14 03:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0cc08067b69819e8bc032368ebccbd82 SHA-1: 0dd3b82a6099300d57da790a5cfbb5cb26cd23ab SHA-256: cdceaf3f07bf180513c8ce3c5af188604d0ed67411066f46f5e78efddf66f573
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 phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the final destination. The presence of these links suggests the PDF's primary function is to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://bangtutrang.com/upload/files/bugebibugoxijawisozanuzex.pdf In PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8d481f523---42391855916.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/36298916577.pdfIn PDF document text
    • https://mauspro.net/upload/files/36659277559.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/bawenolobaxulujojolevuz.pdfIn PDF document text
    • http://royalgroup.at/tmp/23308212533.pdfIn PDF document text
    • http://school15-tyumen.ru/f/68486311614.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/38996496560.pdfIn PDF document text
    • https://network-italia.it/file/4981517588.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/parefotejuji.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/71660527979.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/84112307546.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/14069552047.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/90898858429.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/20988835165.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/nozit.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/84491926700.pdfIn PDF document text
    • http://change4best.ru/upload/file/72856016036.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/87878185764.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/zidigisuzafine.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/95816061761.pdfIn PDF document text
    • https://funbugs.ie/files/file/xasujabutafugojunemibadeg.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6924e92---27211258562.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/51740806921.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=soldier+movie+mp3+songsPDF 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_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 17108 bytes
SHA-256: 6bad518018d1bbcaa156bc7df2360680f53b8dee1f31c0c8f04f97e9f4a3ce49
font_01_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10788 bytes
SHA-256: 7bda15c964d6d5d503b1914be5a6343e7fd569c773548ae83bd638a9d2d4000b