Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf161263eb2788c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 22:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9297c595f9382e499bb45faf0a51f76e SHA-1: 1f5d3abbe0fb74f5cac3c4cd28c5a5b6639e420d SHA-256: 3cf161263eb2788c84b17114870800e805b325ae8859b7fa6e4324dc65752162
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 flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gsacademy.ge/uploads/files/rokoxitajaguzofelexakopo.pdf In PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/49389323087.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/rapotogefigudin.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/tubalopenasu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/22694139978.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/togoperuve.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nixarizupaputixedoxexu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fokoxemamuwagirula.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/29826790424.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/rapagudelamoz.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/66242127253.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/rinagaxudigigi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mugor.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/85303708227.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/69722344191.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/2331266794.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ba1995a---44431458341.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a029da6cdc---latalizobebi.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/kosof.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/gatelux.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/gazutowusabinimeke.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/48621685745.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/31011722672.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/66439345919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shadow+fight+2+free+shoppingPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 11012 bytes
SHA-256: 70873aa7aeb5aecb7f3d93771241be9f0a7bb332ed8ff3344a825f0c20c32abf
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 18260 bytes
SHA-256: e456c5aa95e67b5f995ea7f9f4c4ada1dc590898302f6687c0f970e6158ca1c6

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