Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3158cb10e2c30b3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 05:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3227b7deb79e0686ae04cd3ac0eea5a6 SHA-1: f11d529543c08f7acfe41efc05a91c7bf1920ccb SHA-256: c3158cb10e2c30b3f5079f9c8a071e20999c701e7113ac6bd8fed14532a6e665
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to an execution vector within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=excel+terminology+pdf PDF link annotation
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/27835357280.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210906_66A1CE23EB6FBEF5.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/98751077426.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/fegabemetefodabetejuk.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/torawozodeluxisobilugug.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/lekenufoxepafixonorub.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/xoliruwawijet.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/xirurugimelemid.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/86152219970.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/77376901015.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e655a45753---2159745871.pdfIn PDF document text
    • http://elma1.ru/!upload/files/68399050575.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/refetelonovenikijum.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/galulusepavo.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/latepivogunumafolesun.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/011430252674.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///gosavimukulub.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/66460123512.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/23707615860.pdfIn PDF document text
    • http://gibisch.biz/files/files/zesowodulugopufagox.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/13204827778.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/5635193786137f052a6658.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_off0000bbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 15888 bytes
SHA-256: 4d667909ee41a237a1430fed861255a5c7a13beb76bedaf3e65ed6c6823445f3
font_02_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10832 bytes
SHA-256: 33b2ae8cc581602d77a8ce1e982a282cf6592b3bf3f62fc803adc86d2243ec26

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