Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd867f7c920cb4e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 17:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17fbe8b6803edaed8a48d8a37e571a55 SHA-1: 69a0ad8cc4133b7153523e04da31104ac6d7f5bd SHA-256: dcd867f7c920cb4e0c0e6914bb7613aae901b2067f877031a5e0f1596bf0966e
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 potentially malicious or link-farm domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

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 http://anapharmata.hu/ckfinder/core/connector/php/files/73949076824.pdf In PDF document text
    • http://imcborivali.org/userfiles/file/22109195445.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee4154ab2---rovakasof.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/81631850259.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/powosipuxejaloven.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/188360260.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xaxuxadibewafagevakevemib.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/82905698376.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57272270340.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210904075601564.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/nipumuge.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/zozis.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/63457532167.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/51530311055.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/529545859613a00176383c.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vezewegatel.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/65316600912.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/98138229268.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/bomatefafizigot.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunujewe.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/dumaropup.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/fepolenifosusig.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/19131471928.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/93ae7c2f93903c1ad994842abc70f50c/44074594470.pdfIn PDF document text
    • https://mashura.co/userfiles/files/rerozizufurewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=instagram+auto+liker+free+onlinePDF 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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 16996 bytes
SHA-256: d475dab3fe7d2ef13badffdbd13d59f2a0331a3c3e7fc9d0853c6bba4226cfb5
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 10700 bytes
SHA-256: 097cdefe923ae37ac3ced34c408d5e3de53149f23eaa32856027a7ab33a9b98b