Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7ebb781d38f1cb…

MALICIOUS

PDF

93.4 KB Created: 2021-10-09 19:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e4bc5ce4feb2618544f40df725099cb SHA-1: c68bb2133d2161283b870bf23d55b101160ed4d2 SHA-256: ce7ebb781d38f1cbb60747add91f4cd5a1cf02dbe5f9f84a3cca58e426c6ebf7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns suggest it's designed to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://simbotour.ro/ckfinder/userfiles/files/60231837173.pdf
    • https://abcoegypt.com/userfiles/files/43665831534.pdf
    • http://everintelconsulting.com/upload/file/202110082325384462.pdf
    • http://techmechengineers.com/uploads/nizageropume.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/gumigamoditafed.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452d530d8a1---71800797396.pdf
    • http://open.ua/uploads/ckeditor/files/82240494569.pdf
    • https://testagenda1.myagenda.cz/pictures/editor/files/95269061418.pdf
    • http://telegid.tv/userfiles/file/bizuwig.pdf
    • https://momentous-inst.com/uploads/image/files/rejokikevavif.pdf
    • https://prestinireedcorp.com/userfiles/files/sikuzimafalokegoxumujab.pdf
    • https://phnews.ro/files/file/movefe.pdf
    • https://novsport.com/content/File/wusofanubirarizuronegoloj.pdf
    • https://marljivo.hr/UserFiles/files/29104969757.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/raloviroxedasesidomi.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lijumodopegi.pdf
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/pulukegovazufikixereroja.pdf
    • https://wigs4less.net/nbloom/fckuploads/file/12067571299.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea9cb84743---xabibefofufowe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=easiest+way+to+learn+korean+alphabet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
font_01_sfnt_off0001142e.bin
af2167f26a5e8c6b9af195772b965e4d253c44da0d2c6d96f9e90d3d1992036e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 23176 bytes
font_02_sfnt_off00014fca.bin
d650c2546ad033aa5279f39809b4a382e5344597904fb1021c652a5d0b4b0928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCA 10764 bytes

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