Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dca44b9aa73bfb9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 06:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 576e80e51051f5f148d55ad26b15079c SHA-1: ae8c6114933ac95457bce8aae2124312d15de029 SHA-256: 0dca44b9aa73bfb941841f9827930e140881667fd5e34f84fbdf78eaab311b31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. The presence of JavaScript suggests an attempt to exploit vulnerabilities or redirect the user, aligning with common PDF-based attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://westernstudioservice.com/admin/userfiles/file/92552312567.pdf In PDF document text
    • http://s4l.vn/storage/ckfinder/files/fewodirolu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/81417647142.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/ropusevafigelir.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/texin.pdfIn PDF document text
    • https://krossi.ru/images/content/files/joxunekimawafu.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/naronugojojotalaxij.pdfIn PDF document text
    • https://mihalex.by/files/files/katidemilinowalepu.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/dawiwamugubogimer.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/bozisotumamolowigixigaj.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/89318200503.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852e2e6271---zutatumute.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/18457941988.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/robumepokizukogagop.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/39465609460.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/49282422573.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/91910772687.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/20499561u06icqj67i7tco8o0o/gugigimulinutorixigik.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/9217139786.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/42925966992.pdfIn PDF document text
    • http://labonscafe.com/userfiles/8657032285.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/rezivakijiwumavovetibikij.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/foxuzokawezebadopizoki.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/51425996154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+android+kies+software+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_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 18416 bytes
SHA-256: c0d791abf01010d197f196018fb8f3c26dab716e0ec25cf0e80da32c21fc697e
font_01_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 11048 bytes
SHA-256: cb1883e5d57902ed4307fef0037bba51ab1d047ec70f66236e9a30e2963d28b3