Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e924efb8a74b5a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 23:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d544a8daaf4f39439975b377fcbeefe SHA-1: a24df7fbfb49e94019ba3271f7cf271bb4948cd1 SHA-256: 12e924efb8a74b5a5c9defceb3bb67984ae1881f8291fe680bde7eb3fb683d58
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's structure is optimized for search engines to promote these malicious links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

Heuristics 4

  • 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
  • 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://hanilkwanla.com/uploads/files/sepuvibevadagej.pdf In PDF document text
    • http://vngo-cc.vn/cooker/public/files/pekisowibadunolex.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2f53bceddea08ac5acbe04e87bf3878a/89505491968.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/30725308587.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/11070941000.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/31jonc6ig0hs0r78atrd9704jb/55515148097.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/36028717099.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/farokenivufevesiros.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/zelalemamimobokexinar.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48874499426.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/rageditigunelegid.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/88724956246.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/bukutowanobon.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/69071252134.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/rinivotajuluroluxixumulek.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/27600732758.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210913051738091720mle9g.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/zuluwalupevo.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/70535964425.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/duxabidekupugewiv.pdfIn PDF document text
    • https://lesura.net/userfiles/file/47749428895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+app+for+increasing+instagram+followersPDF 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_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 10956 bytes
SHA-256: 53379e1e1ee95ceeab60d0c05635411386a86732d0f39bfc8cb7bf0ab432caaf
font_01_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 18648 bytes
SHA-256: a24bfb22d93e368c2de1782336c93f688eaa6e62a85b6ad98373a1783d97d2f9

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