Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce4b8d993323625…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 00:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68c645def02fd94df7caff9009e82acb SHA-1: f6c2304ad945e3915aa0f024a3bb19d550243f17 SHA-256: 8ce4b8d99332362566303f4146f2c461f2a60717a2216580c6bc7f21133870cb
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are associated with file hosting or link farms, suggesting a downloader or phishing lure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The presence of a 'Visual download / call-to-action button lure' heuristic further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://femagnet.com/upload/edu/article/file/tegugakagujifegenovu.pdf In PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/wilexejujaxivosuponofup.pdfIn PDF document text
    • http://happy-land.hu/editor_up/62060422886.pdfIn PDF document text
    • https://tdfstore.it/file/60287157999.pdfIn PDF document text
    • http://centrons.com/uploaded/file/68500661861375fbfd36e5.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/92229105830.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/63837114648.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/28832267238.pdfIn macro / runtime command snippet
    • http://vendsol.com/userfiles/file/wunuxilulemigo.pdfIn macro / runtime command snippet
    • https://arhstroi.by/uploads/files/sosimogejelejisaxijo.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/31853010555.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/maxorixixubiworimitum.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcmrlo8gmp1uo6e1mjd3as9dt1/nunititesurimefet.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/dojoxiz.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909183316054.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/tarotilajerotutegorupa.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/pidelixe.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/xewife.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/97479176132.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/mufedifubefisiwijekor.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/famuxovekasipizi.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bexutaxamugejimur.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/rozolufaguwewirit.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/29958539364.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137914284acf---26300157880.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zeleromaloxugalimunofozu.pdfIn PDF document text
    • http://xinchenfast.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wrong+turn+3+movie+downloadPDF 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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 17224 bytes
SHA-256: 695b6fd38ce279db315a5251819e50c1536b667e0d2b51fd645e9fd685e6d721
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 10840 bytes
SHA-256: cb3f1fd580ddf5c04fff1e7cba77fe2341b7f1d2a11817b15281f2f622bb6b0f

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