Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b178ed0b1b811e9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 18:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e81ec95885107c511b79eecfe1fa235d SHA-1: b5f1d3fa44e6bf464539324de90818e018a2c8bb SHA-256: 1b178ed0b1b811e9bc1d3b54cd8ecca3e1670c9de12f1ccc21839c84873d2cb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=harold+and+kumar+go+to+white+castle+stream+full+movie PDF link annotation
    • http://immobilieninvestors.org/userfiles/file/kewedofetunilis.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/jowaremuji.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142262ff0eeb---91393833408.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610f02841f---lipepasasobixabujev.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/lalejalilatolo.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/76551695525.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/warijovufatubenu.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/podasu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/ditazikepej.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/ruvezusaleritakazegaruf.pdfIn PDF document text
    • http://learningkey.org/userfiles/xuwodumuruxejadusoxop.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nazovukogofogudu.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/77627757690.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/wamar.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/xatudanitasunufagoluve.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75954850239.pdfIn PDF document text
    • http://delifarm.com/images/file/57962255749.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kesije.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/2745505775.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xibezorivuzisa.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jibufujuboba.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/73241565652.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_off0000bb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB53 11260 bytes
SHA-256: c78809fbdce92791ad0a042546d5b2091e3789f931872d8e705a6fe0a6be620a
font_01_sfnt_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 19876 bytes
SHA-256: 7cf0fb585dd75e3adb741752ef42cfdb676df284007ece8bb248d039931b4b20
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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