Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2ba1061544a758…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 12:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a89f90bb34f05edb91a1e6335ecfd19 SHA-1: de063f61a02d63db6600a96bcf2cde1b5dfacb3c SHA-256: 2c2ba1061544a758dce43eb190754b0c0a12fd19049f19f6b48f07c28d0f8d85
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 and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or facilitate further downloads. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ginzaoakland.com/uploads/files/linap.pdf In PDF document text
    • http://decorstore.eu/upload/file/zivobezax.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/felikew.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/47971908001.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/35326756313.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/lajofa.pdfIn PDF document text
    • http://grafitym.kz/files/file/38334681707.pdfIn PDF document text
    • http://ebus.cn/up_file/file/89649855583.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zoxifawe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecd34ffc3---72293763059.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/34755427470.pdfIn PDF document text
    • http://onlinevay.com/upload/files/22740275196.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/ac6f088430725d15afef589fc8bfd6cc.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1e3d95791808cebcd3f34c4a49ff7cf5/3796188167.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/kutaka.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/bojafujejetu.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/42984780121.pdfIn PDF document text
    • http://jngf.cn/files/file/domowugasumun.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/fejebosiru.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/36324144650.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/ravukex.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/44970758482.pdfIn PDF document text
    • http://bdnchem.com/upload/files/bowajefoposatapipetukev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pixel+car+racer+mod+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_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 21624 bytes
SHA-256: ec845ef5aa4367d7cfb6d8b7b9d2490584af7b5e685921afc12ee95664083f14
font_01_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 10452 bytes
SHA-256: d5e54d7e0a770b6fe87f72d6e41e0acdf3439c331a06e50e7b4bb35364a8a147
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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