Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca98daf84536e3d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 01:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c97fc366cf2dc5c6bc728ee931594b45 SHA-1: 7d0c36817f5feb5953cb188193c094ab1c9e3f76 SHA-256: fca98daf84536e3d3dab59f937a69704d642d471010333185c9e86bd534d045b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://www.papelerialapiceros.es/ckfinder/userfiles/files/34818925081.pdf In PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/wegonisumufigakizikalod.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jifagud.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/88961460982.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/62802655446.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/69236438988.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142606d601c0---kimesepixaginavat.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/mejokedu.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/78137187.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/jutepagelasufemezogaki.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210921115409.pdfIn PDF document text
    • http://birdwatching.sk/media/file/mulunagugakax.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/18165134230.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/48448169835.pdfIn PDF document text
    • http://koutingchina.com/upload/files/46062479807.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1402f823---womitunobajagepaturoben.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/52572463286.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/8609259664.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/27270647280.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/foxeraxazubobawilu.pdfIn PDF document text
    • https://endobible.com/userfiles/file/95100378901.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/38700844155.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kedazajewug.pdfIn PDF document text
    • https://luminex.pl/upload/file/zazatalopatuvugivobijesa.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jofonirumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=instagram%2B%2B+apk+2021PDF 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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 17476 bytes
SHA-256: fd8149fde3da1e25ee33e96a01299fb21357f54df2a79c043b344fabef112d39
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10540 bytes
SHA-256: 7af3f1811ee95700b9fd30c9861a91dbd7aec9ad232417615e4a88b50d51d358
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1