Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bebef1a1026571…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d386ead93ffc1edb5b6af70d388947ed SHA-1: 9adb3b80f92aaf0deb3dbb18e9db07abd371016b SHA-256: 23bebef1a10265716451c9620fc43b6495c314dbc788550e1c01fc55cceb11ac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

Heuristics 4

  • 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.
  • 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://philabc.ru/uplcv?utm_term=app+pengeras+suara+android PDF link annotation
    • https://associazionemusicaviva.it/uploads/file/25917539996.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/defisudajej.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_041243.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/36680629890.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/31804282947.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/3481742750.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/leriwuwi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/joxutafiwemoper.pdfIn PDF document text
    • http://lactopad.com/uploads/files/92310160030.pdfIn PDF document text
    • http://leeandrewdavison.com/download/51457406838.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/31333536373.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/95522747952.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/69937570336.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/gulofanof.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/05/96909230913.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/37996236089.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/rogazakinufijodugivig.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/38196638035.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/73963407921.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/gadizoxazivimudojo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ec99409c---16868906695.pdfIn PDF document text
    • 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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 17556 bytes
SHA-256: 4a13e9eb27ac2860d317d6d39f77a6441095524014d2b3787c80c9b378502aad
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10504 bytes
SHA-256: ad63d1f163db3574d090f4f6c316f81a451560f6bbfaf07a9b3f8bb22573bd28

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