Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63199ff4ddbbb64…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 10:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5e7344078f142e8c1f7b3f97ed54eb5 SHA-1: 8b77a6c6e66e7ae5531c8e398835e2b4e0de83be SHA-256: b63199ff4ddbbb64eb612cca82986f9604464b3cc35991507a52a88ac8c4381e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. This script likely redirects the user to the external URL 'https://pixomot.ru/uplcv?utm_term=top+100+phrasal+verbs', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent due to the presence of numerous links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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=top+100+phrasal+verbs PDF link annotation
    • https://aradmissions.com/ci/userfiles/files/32965383994.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/worisalaguxeper.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e93357e4---lumabi.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/31555917551.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/29495509953.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/82077292088.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/gorasibu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62395029553.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/6768926624.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/gemosovifasu.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210911112225.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kopobukekepijikixonuxex.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/nifiwemobule.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/15467054729.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/51434623373.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jetamujevekimunifog.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lamedilenokovibag.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/galofakenomuxos.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rexenigugipilijito.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/zewufinibudamorosabu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fipotorufadulu.pdfIn PDF document text
    • https://lapdonline.org/file/bofozopatanoni.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_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10396 bytes
SHA-256: d1e4c319306fd8ee351c20dbd8498b370d1a5ff14e7f1f21123d6af7b1f2543a

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