Malicious PDF — malware analysis report

Static analysis result for SHA-256 d609eb0770063cd0…

MALICIOUS

PDF

91.2 KB Created: 2021-10-07 02:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3148972f528fc9e414ddf9539d8e214b SHA-1: 65afc629f69a192ec1a0c6bdba6f8f1be5cbdcb1 SHA-256: d609eb0770063cd0f888c3ec8ea6acfb6605e33c5b23839aa35f32d6cfc54652
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=twice+baked+baby+red+potatoes PDF link annotation
    • http://teknis.it/userfiles/files/zurifosufegapig.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/satubawupoko.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/rokegakupubujubuku.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd3b38a4---74794606111.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109191958384197.pdfIn PDF document text
    • http://sooclose.eu/upload/File/31641893873.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/xoxexife.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/durola.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/jufusitub.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/87617025588.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e654ed6f64---xozemezogupita.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/47841429539.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bolebin.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/vigelaturon.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/36824570241.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/gebasevomaropiju.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/kiwunubuvaw.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/9863913687.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/jupoberedinap.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/xesugikowuziseja.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/mugejawob.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/38016731884.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/fixedujatizefinanug.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/tifonevarep.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_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10752 bytes
SHA-256: 03b89fe4754b49ca338c724053a6ecd9f653bac0fd6d97481714f15f17cce549
font_01_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 19876 bytes
SHA-256: 5852049fe4fcd9b337d0035f516d74179735a0f35ec5cdc27b36bb7177d79c12

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