Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b450a175fb2ffbc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 08:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3569b2d301f2cbfc63938e0d4dcff159 SHA-1: 165d7c685eb9c354bff560ddd5a78164cc83fdf6 SHA-256: 1b450a175fb2ffbcb0d7f80d3f490ed0bf8f8cd0dc74f87c4e1d17e5a1f283e3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tomasmrazek.cz/userfiles/file/15377646319.pdf In PDF document text
    • https://gegeny.hu/uploads/file/zavapara.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/85943655835.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131571ec8cbf---gefoguxiredibogugo.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/59617805954.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pavijosu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/roferaxapurabotetipofed.pdfIn PDF document text
    • http://indexone.ru/upload/file/46813643700.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/rugadosiwese.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wajus.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341431f1b3a---71811975592.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/92554468194.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/wetobevidu.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/81741633288.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/44330518473.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xoboditilozolawopazokuna.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/muzamejenuzefavizavedi.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/saxijefora.pdfIn PDF document text
    • http://jar-ted.pl/file/zawovokimedebora.pdfIn PDF document text
    • https://togeltop.net/contents/files/vafavu.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tovekejunafejuzubotuw.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/butezojarurub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dialog+4g+settings+for+androidPDF link annotation
    • 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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 10608 bytes
SHA-256: 5ec9147fab997bb234c33bdfbe4211de6f277dc4df3c0ccf164223d96ad83bff
font_01_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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