Malicious PDF — malware analysis report

Static analysis result for SHA-256 751661159e03d215…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 15:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a5ee3787050542d213e8addd133cc80 SHA-1: 5ac03acf53286df031d8cf5f6c54692224dd2988 SHA-256: 751661159e03d21549ad4bd48b45f5b5cd4f2d517925e7ae7e22821881524b3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

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 https://kettosallampolgarsag.net/imagini_ws/32549046311.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e9e27925---84750515728.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/xolezifulufuselutaputo.pdfIn PDF document text
    • http://getem.pl/files/file/xibezusojizigi.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/puporaw.pdfIn PDF document text
    • http://teraval.cz/res/file/todijavogedusabona.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xoxutokijiwoxifoz.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/saruwopizemomegak.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///tavukujuvune.pdfIn PDF document text
    • http://klhl.com/userfiles/file/20364201715.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/donilerekusuxukepolegexo.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/69258359804.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161340727e80c1---kesewedevukomuriroki.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/dalulisevimefa.pdfIn PDF document text
    • https://bliznacite.com/files/12630117199.pdfIn PDF document text
    • http://screen.by/images/file/65806504176.pdfIn PDF document text
    • https://lorus.rs/files/fuzalurasitodasuruvutewu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/taxatewidep.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivike.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/33852679034.pdfIn PDF document text
    • http://veitali.com/upload/files/nopugitezosoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+transfer+my+contacts+from+an+android+to+an+iphonePDF 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_off0000acd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 15524 bytes
SHA-256: d52cb152f5a63005f80c7da7e16d620915d23aae0f954690b193074708ad24c9
font_02_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 11028 bytes
SHA-256: be80ab98007176788ae741c15e09f541a265885fd6ba36801f13d7746e8967a3

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