Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8ed8586b8a54be…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 15:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02bb7de16d7b78c9ea6cc600a744ee7e SHA-1: 0d506f0066a4a387a349060f87e56f68358a97fc SHA-256: ac8ed8586b8a54becb6a16f0d331b00e801d10c6758df5919b681d28828208d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious content or redirect users. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=transfer+from+pc+to+phone PDF link annotation
    • http://ipceurope.com/assets/file/voresusiruxupuz.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/6369491987.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tavumos.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/6385771620.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zigukalopazili.pdfIn PDF document text
    • http://fkhd.cz/data/img/46019196536.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1f4d7d5cf1e44299eb4e09202352f168/73583435043.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/lisukatajixituzirazez.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/favuralasudifidapu.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109050745355663.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/vosepifewagidulamo.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/69316260423.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/492455605.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/terogipofuw.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/79625918197.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/1130383832.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716862d40---kulateludivifa.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/gujofaribenigajudujumirix.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jusapenebubipefusazaweba.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xapekikexegoradudiseka.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/tijit.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/941516645.pdfIn PDF document text
    • http://chicopharm.com/upload/files/46676312559.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vupelakemelikanifig.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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 10568 bytes
SHA-256: e065dba3b58bb26ad5a41ce22f8cf3eee908fadbdf97c680eb0715b76e43c9a9
font_02_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 15140 bytes
SHA-256: f4dd9c3ad193ac17434d6d5a1c8c816bed1e1d23955d15ae23eb6248c15815da