Malicious PDF — malware analysis report

Static analysis result for SHA-256 730a81031f30a568…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 19:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bd07ef6a863424474c3fa8d946bf628d SHA-1: 9d47ef4ccbc5d7c21400568cd2264e46bc9df472 SHA-256: 730a81031f30a568178924c30d723160115bdaab663eb797cfd4db4b23dc1fa7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV, containing embedded JavaScript and a large number of external links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4606

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.
  • 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
  • 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://brs.jo/userfiles/files/51856311362.pdf In PDF document text
    • http://asude.istanbul/ck_images/files/sotuwamamabexekazajakavus.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/wurisamimazuvarewujolad.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60778595003.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/refatopijikidivami.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/82589201943.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/53652936684.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/39957424823.pdfIn PDF document text
    • http://dentistturkey.com/image/files/48570940999.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/26761193080.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/19602563323.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/44676f8e482222376e5ac574eb8dda96/rawuju.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/linitubakesigeve.pdfIn PDF document text
    • http://kco.su/userfiles/file/86031869108.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/5657789646.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/vunozalizomijigelew.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/95534825038.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/zijasefepemigilakiwo.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/pozidejejirezatamoxokuluf.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/18265947284.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96786606757.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/68585632961.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/47068832637.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/35255888585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hunger+games+pdf+chapter+1PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 10952 bytes
SHA-256: dc03fc1e1c14443a71081ff2fd66683d6f62919e490f3854326eb3c3420357b1
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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