Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1eeb5824edcb4b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 14:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f05e655a4c70ef52a8630a986af7d884 SHA-1: 6f7c4d13e0700ee3f16f5c538b9d559090f07654 SHA-256: 5a1eeb5824edcb4b37b1d5d91533352b64050aa41ebe457a08d40b266e995faa
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV. Static analysis revealed numerous embedded URLs pointing to various domains, with one heuristic specifically identifying the PDF as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3632

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://medvor.ru/uplcv?utm_term=what+is+antutu+benchmark+score PDF link annotation
    • http://kosmonautika.ee/ckfinder/userfiles/files/17256003624.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/43802609134.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/tikadob.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/jotona.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mapene.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/63922076522.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613023932b120---5287331817.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4ed5adea8205da9c3a30cfdddf1d682d/tegiwirigibob.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/57649669234.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/44939676170.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/gatukipuworowajuvo.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mewuxupater.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puperimerobiwe.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/63713026694.pdfIn PDF document text
    • http://chikatere.com/Upload/files/35530506339.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/731950329.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/sivosajixowuseja.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/81235481415.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/gerolitivuzaromuve.pdfIn PDF document text
    • http://reylab.com/userfiles/file/xedoge.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/molejaxoge.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/zawaziwazafuvazina.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902133109.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_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10772 bytes
SHA-256: 3fedb20032312ca187c15ddf9893068d47072938d7af00c19b0688f418b6eda2

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