Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c3a7711024e029…

MALICIOUS

PDF

63.8 KB Created: 2021-09-25 10:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2b2c1f40844352f5c07972e0ce65111 SHA-1: 96b3bd5f87c70006174612cd0edd0b1301778603 SHA-256: 28c3a7711024e029043124541f7f7b5ebdfcce02047c180dd80447617801e718
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to obscure the ultimate destination. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

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://bamfieldrental.com/userfiles/file/welafuros.pdf In PDF document text
    • http://gs-metals.com/filespath/files/20210911220632.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/66057688788.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/64636816436.pdfIn PDF document text
    • https://e-room.co/userfiles/file/xilesabedakusiwa.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/pesanazevaxe.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/5444277472.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ac9fa1ab615782bce7875f9fdf1a7455/xenipotuled.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/biwiguvatimajamomige.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/tavegazerug.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rajisavijamil.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/55518510235.pdfIn PDF document text
    • http://gtshotel.it/images/file/mimux.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/moxipajugepe.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gugokurodojejonafuxebi.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/zanedopotozogokulinom.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/sufusazusasotazidojaki.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/28279131969.pdfIn PDF document text
    • https://majubesar.org/contents/files/jetijaxukajogitof.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/959981487614c29d194d15.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/94817841403.pdfIn PDF document text
    • http://medrea.ru/upload/files/zalisabonore.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/powasabog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+pc+software+on+androidPDF 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_off0000b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 10688 bytes
SHA-256: 5de80135784cb6642049e1b47af716d6453a92e204515c3b6bb2fa7227220e68
font_01_sfnt_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 16956 bytes
SHA-256: 16a3daf7c11cf20cda2297e3da90d2293e937d621ae987d838f7260ab0dceb16

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