Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7c57e28d598d21…

MALICIOUS

PDF

62.3 KB Created: 2021-09-09 01:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b4cbfb4e238b9c1eedd5b5522d8ce83 SHA-1: 0f863e647cc804886d1685e5b17efd153172ee66 SHA-256: 8c7c57e28d598d2105088b02181f8046fac35e6463ffe0c765d588d8fe546d39
124 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many distinct hosts and links per host, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, indicating an effort to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://www.xyoaa.org/sites/default/files/files/xaxubizakujaveveke.pdf In PDF document text
    • http://dj-venci.com/uploads/pages/files/9939037416.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/vibiraf.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/79216953632.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_968256AF25A18B26.pdfIn PDF document text
    • http://unseretochter.com/images/file/rolajusomogibegonud.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3bd7e65bb81feace047ff19af1ae022b/vevajuwabameretavezegumof.pdfIn PDF document text
    • https://hssanesteban.cl/files/sedisafuribuxuvuwawudubef.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/76122399703.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/vivifejinepumidinivide.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-23-38-48-95.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909015702382620.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nadokazewatoz.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/21027627366.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613932405ac8c---xukopifidewepikikuguzivuj.pdfIn PDF document text
    • http://calisnt.com/uploads/files/20191540896.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/35478895061336dc38b2cb.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wewuneneroxoseriregi.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/siripubomela.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49653693885.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109030735392136.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/62679808444.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/wobalajapevunubisedu.pdfIn PDF document text
    • https://10fci.org/userfiles/file/sonododamomokod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=grand+criminal+online+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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