Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac992c330f7919d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 23:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8d0c4fcbdc88194ca76e5b4885bf739 SHA-1: 6dfc628cfc0b68b52153f641b7811033bc610f59 SHA-256: cac992c330f7919d9f6c0e370acbaaf9f7a31e9413d14928b6b6d59c38746b78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute further malicious content or phish users. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=seeley%27s+essentials+of+anatomy+and+physiology+8th+edition+pdf PDF link annotation
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/fojatodabusewovavis.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/56448891621.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/51645512254.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/notugurodogakal.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/vuvasiwotoxuboxosu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130047b25813---wivemesu.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/32399472898.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pelarirapatefewutasebol.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/867620237.pdfIn PDF document text
    • http://wohingltd.com/userfiles/belonepe.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/14975529242.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/sididabazodi.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202194146255257.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/xifaremupejavo.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/wixewijegunolabijabem.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/tefadapemibu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/81198238981.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/25437061880.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/25321732145.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/bekepev.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/8204410436.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pigivufemaxijuxo.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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 16724 bytes
SHA-256: 946efdc4b3bf4029fb66b8337fed5782e0d633b5679adf92c12d4f9af2b285ca
font_01_sfnt_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 11276 bytes
SHA-256: 696f5a46b5969a0f68d266035f8796e60c6e5d6962cf703b494b280c384a668d

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