Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed9383bffd256a7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18c5835f8aedcbd15873025720f8f14b SHA-1: 4eba2d5a4bbf92e596e5dbc75bcae21969d6aacd SHA-256: eed9383bffd256a78cbef5ef7d4e5890beee6fd04655d1275077ef59d7dbe205
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 hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=android+games+list PDF link annotation
    • http://tuzvedo.hu/elemek/file/mevibogutorokumewekilifa.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/begini.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/tukepe.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/25747595576.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/nunazudom.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e40fb8cc47---gajefavij.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/79116763832.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/rurufad.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/senutijijuf.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/gofepewetinixevesigejofu.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/kofatevusepagavugo.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/dowolunigukopodozetivamem.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/baliwavepoxitarite.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/72474051494.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/3010056321.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e637a329---15791173260.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rixarekikeren.pdfIn PDF document text
    • http://riph.pl/userfiles/file/kewufiwowalisaw.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/36231204214.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/zijimilon.pdfIn PDF document text
    • 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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 10572 bytes
SHA-256: 7a4b29aabf46024a2981e69e29d960ae89d18d350e2bce290611e40b2ce941ed
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 18104 bytes
SHA-256: 0ffccb5e4981b29bcc551f4a09a01c84b21301152edff2c50f8888c64b45f548
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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