Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7b781551d8e8fd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-09 17:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16c6d771a5c7b9a0a7d0a4910a6bf84d SHA-1: 17a8bd74334e714fa7c5b5dc712bb4f6155ea01c SHA-256: 0d7b781551d8e8fd930bb40436ffccecd7330f4d1b35073c951fccc822400029
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it is a link farm with many distinct hosts, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ozgu-yapi.com/firma/files/55303021398.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jewawijab.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/fosifaf.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/nogezil.pdfIn PDF document text
    • https://birotex.rs/images/files/xukula.pdfIn PDF document text
    • https://gameclub.by/uploads/files/41723561016.pdfIn PDF document text
    • http://sergeybazarov.ru/file/vurasulu.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/95556229769.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/kamab.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/86085999153.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/94636063604.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/vakogop.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/kuredi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/87054320036.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134411b45a37---57431821910.pdfIn PDF document text
    • https://fasleh.net/Files/files/12479012887.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/050702a3367c5f603b6097f82b4a91ae/86849498477.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/68301694083.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/25731941304.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/dolazotigapoponikududupa.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/18649736333.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vonudokuwexagesetomuvu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/35831202561.pdfIn PDF document text
    • http://webs123.com/userfiles/file/vonowapomogasav.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/78807624234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=archer+hero+3dPDF 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_off0000c31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 9952 bytes
SHA-256: c6f13bc5d4a1736e7923aab3739b7c3e1a5321bf1ea5f130867bcdbaf13f00ac
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 19928 bytes
SHA-256: 3d52bea438cc01ce0f4b495c29153e7acf78a5ef3cfff7e77a0c89a1c60aa53b