Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce610dddae6739f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 14:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f26ff4308875fa31720222151904c23 SHA-1: 7cdf812cf0b3b0cd369d56a57f7c2ba8b4c1b8ad SHA-256: 2ce610dddae6739f8fbafe75a457f00488772f59caba954ed77b89b6dc2df2f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ensky-chemical.com/upload/files/86382180152.pdf In PDF document text
    • http://weifong.tw/fckimages/file/80376581964.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98c9cf33b---99354852162.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e8d8897fccd104cc89c80e3b3a6b2fab/51898223494.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/30883725382.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/79681010725.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/44732304712.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/nitevat.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/muxig.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/pefat.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/bevinero.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/valenofuzod.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109011254476998.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/wekojajodon.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/86929788982.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/35162241329.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/31069019297.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/17452098482.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/63426468068.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/nopivonojumunepejomozido.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/vemoxujadilaluso.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/xowinodifatawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+fermi+dirac+distributionPDF 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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 10900 bytes
SHA-256: e1b6814bd47740470905a1a39e07fd2512822af988d981fc44bd89f06ebfd047
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 20816 bytes
SHA-256: 2f19b47a85d643a5006cc9d6d0c52534cfbc7265a27872ae35ff61ae9a666e75
font_02_sfnt_off00012f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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