Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf0750f0fa6253f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 14:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2ad7c53d84df71e681ef0373489b9bd SHA-1: 1397ebeb7080e57ac1d31f52d572f8fbd3826550 SHA-256: 1bf0750f0fa6253f55ec6e871f9d8e0122e6d0b76630a0e51f5b6cfa6fea235f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm containing numerous other PDF files, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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.
  • 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://dawnraytech.985.tw/data/file/userfiles/files/penajarubafexon.pdf
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/sosobubaz.pdf
    • http://costruzionibulagna.it/userfiles/files/72878228960.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/32827215446.pdf
    • https://artedelvalle.cl/gal/files/file/1012022542.pdf
    • http://madang.eu/f_pds/fck/file/wikesofimojotemixugizebi.pdf
    • http://garage-ys.info/js/upload/files/weliko.pdf
    • https://www.ijestr.com/ckfinder/userfiles/files/24022612032.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161336d3772c7a---petopaxefiwedumibuvopot.pdf
    • http://unityproductions.com/upload/files/posadaxadinosituluki.pdf
    • https://afra24.com/basefile/afra24/files/fosigawi.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/25359771804.pdf
    • http://escuelasfutbol8.com/docs/files/91348919705.pdf
    • http://daeryuhealthcare.com/ckupload/files/bemakebalamafojunujog.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c63436e6593c1ae7e65e7bf4049b7c69/gasenovobizufeniwifurej.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/kuzabidatogibiwawe.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210903_1A11977B6AF4FCDC.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/ferewemutufav.pdf
    • https://harrisitalia.it/uploads/file/81674953690.pdf
    • http://synergyproperty.com/images/files/64131277517.pdf
    • https://cooperspick.com/files/zosojodoxoguredugeluk.pdf
    • http://normel.org/files/upload/file/8069604808.pdf
    • http://autoscuolavalerio.it/userfiles/files/fefenemo.pdf
    • https://cpsguffanti.it/uploads/file/firizaw.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/lamibovalijelebufi.pdf
    • https://mantyobras.com/userfiles/file/balosukopotinovizomopor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rinnai+rl94i+parts+manual
    • 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_off0000bf3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 16792 bytes
font_01_sfnt_off0000d74d.bin
bf73dbdb63916780e76c8d30d362a8760300978647c944341dab093dc6867b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 12240 bytes
font_02_sfnt_off0000f436.bin
9bb2675bf3fb542bb40339dc0d0e75d4772b03fa45581463efd641df64d8f114		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16420 bytes

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