Malicious PDF — malware analysis report

Static analysis result for SHA-256 944af2071b9daa1a…

MALICIOUS

PDF

62.2 KB Created: 2021-09-10 09:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 647e84dad01504573d3634f520d45a01 SHA-1: a49d91462693d468cf6affb0df7c02c5238e3807 SHA-256: 944af2071b9daa1a0279d3f610247493ce01dbe6b295f9c6df9a32a66f311383
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on potentially disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=dr+dre+compton+soundtrack+full+album+download PDF link annotation
    • http://studiozoppini.com/userfiles/files/15063147530.pdfIn PDF document text
    • https://swiz.eu/files/editor/86699078000.pdfIn PDF document text
    • https://polaria.cz/images/file/rivukekebabe.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wepogoxopalogelega.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/levajoravin.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/roxidozanilepopowowiziri.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/99760622180.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/simudawadidovasabin.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/2685229137.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/20275509272.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/37778638335.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xafitufot.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/13411989784.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/35823990366.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/mibomidigax.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/vabupajir.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/laxupabasep.pdfIn PDF document text
    • https://mlspoland.co/files/file/bozavinagibifazuf.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/tegelodixeboba.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/vaginodifimelu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/tuzixufigelafafopisu.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/18657629337.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/notabevizuresu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/tokepipurar.pdfIn PDF document text
    • 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_off0000bfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 17248 bytes
SHA-256: edd280103ae62568258abc13ccfef9b85071130b0cb718308833da1ba00644d3

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