Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b855ca225db24f…

MALICIOUS

PDF

66.8 KB Created: 2021-09-13 18:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4f5aef14c4dafd5686ac21b5aa054f8 SHA-1: e5c07c79413e7a7b3409f0cfe37fd0b385251f0c SHA-256: c4b855ca225db24f7f87cb2fb7e60aabe5911da5d381518055cee10d9007ee35
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded links, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5299

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://pixomot.ru/uplcv?utm_term=uninstall+an+app+on+firestick PDF link annotation
    • http://e-menu.hu/editor_up/retiramabimajisezu.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/69111526990.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911081732703553.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/simakatixapizukosu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/86695049043.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/80834577510.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/44475245507.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pijomuwisevujuzuro.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/voxijepase.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/49431615827.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/wevafa.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/92937836839.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/91976793254.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8b51680be4233d02d1a82e654ab97cbd/pepurapudujabamukorun.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/14059095427.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/fasabivukaja.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/23820095970.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/mixaroparazazufarezasa.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/mukamuno.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/tufisirasovudupale.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767fb42001---pareputomomosarukizede.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/lutirebexisaxubobi.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/kasofu.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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10572 bytes
SHA-256: 8cb456a9cef34b66e6e8d2451476e231d364220636e51293ac972be64c0655e8

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