Malicious PDF — malware analysis report

Static analysis result for SHA-256 101365ed0d6c636b…

MALICIOUS

PDF

55.0 KB Created: 2021-10-03 12:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06d3b7fa1ecbeb2653f44d239378a3da SHA-1: b8cf812582f58e41ef5e567e0bb84aa6f0b5096f SHA-256: 101365ed0d6c636b69ff5679434b794ec89b7ced2ee8356cb9a7986f5bd15ff2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a deceptive link farm. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8534

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://pistant.ru/uplcv?utm_term=mca+oral+questions+and+answers PDF link annotation
    • http://zevkotodoseme.com/upload/ckfinder/files/sonudirezesikinor.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210923072804.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/67212730036.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/mirogexuvi.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pojuvo.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/48656735501.pdfIn PDF document text
    • https://frisch.ro/files/file/62541141693.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/pisikurovuzifovurolumeni.pdfIn PDF document text
    • http://pbpharm.com/upload/files/tojexasofep.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/nanevebudarujo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e383ba139---70143064668.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/97655743056.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/ruberosajobaladixi.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/3698131657.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/88079695314.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/mulutebunetelonaneruno.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/982209057.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/lapezimumovuvuferedisik.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/99606370975.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/luvovenagowatire.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/82131271799.pdfIn PDF document text
    • http://ndt-ultratech.com/files/soxosodo.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/68272857303.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/lemikirokenejuvadavu.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_off0000b2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 16316 bytes
SHA-256: 6683f9bd41dedf04d8bc35a4c599cfeac7187a7fef59c96b444259fd1ea1e523

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