Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d6e5d7c0331c6f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 17:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b00bef3cbec0f44ea2011a704787079 SHA-1: d85c3377a92b81be7f552718b292d0a0957cdbf5 SHA-256: c6d6e5d7c0331c6fd11dc3f050f9b9176159ed3c6170d353d5b1bb49b6b6dc25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to domains associated with link farms or unknown content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://loffoxfitness.mvwebsolution.com/userfiles/files/moxunodavibebinebatotas.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nowinatiso.pdfIn PDF document text
    • http://specimport.by/files/files/romaxovixiwopagovamiguvi.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gozosironetemibuxiniv.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/jonedome.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/rugobekelofunapov.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kivowolaxakebupigosu.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/miviten.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/81630262248.pdfIn PDF document text
    • http://hangquangauto.com/files/88866912113.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/16904729838.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zokajade.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/vebebujeginojetifororosov.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/76098324346.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a61a84c321---23699484407.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210913_6B91527E93EE66C3.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/libikanojuxuxixajej.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/47704192126.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/43f8a8f7ae1a2aa4861a8fd5e27a285c/dibinofiwuzi.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/1170721334.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/wivekajokefogojavabina.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/lupatewufedukoxod.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/84839753695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pubg+lite+obb+downloadPDF link annotation
    • 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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10480 bytes
SHA-256: 99545e618427d7214b1d7b1fd4d0426526b4efc5df1211570d3f47d350ae32fc
font_01_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 17192 bytes
SHA-256: 00402bf25c9a9f8299e70e256a9fafda1129e0f7fda397c0dac01d22721eb39f
font_02_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1