Malicious PDF — malware analysis report

Static analysis result for SHA-256 340c125b5f8ae15f…

MALICIOUS

PDF

82.5 KB Created: 2021-10-16 08:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9aaa8eee4f6b5d993e3367c4c14927ea SHA-1: 6d327608cb41aa3367d268f1329a96d4e37af025 SHA-256: 340c125b5f8ae15f0c18b8236f1337244e8312383499f1ae0f14a77bf0dbcaeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/uvsvfbohj6n71f9e4a2fq6aq1j/93029266500.pdf In PDF document text
    • http://generaltubi.com/container/ckfiles/files/kofefe.pdfIn PDF document text
    • http://specimport.by/files/files/14346223271.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1616265b382263---woguxutobu.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/doxufuguvatejuzim.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/woteduxogawe.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/40533761765.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/65555773859.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/kadilowifenagex.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20211003_E63122ED891DDC86.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/mapuxakoxirefukososedigag.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/37894913523.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/serogaru.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132302da9ec0---posuxupopegenawobal.pdfIn PDF document text
    • http://proxima-design.cz/files/file/wexubofe.pdfIn PDF document text
    • https://yuktogel.com/contents/files/81407931571.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/menaregelewafilexavudoda.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/82929569924.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/salaresajesosobugusezutap.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/50355944181.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/foxubuvexad.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/dusogoriruvojukej.pdfIn PDF document text
    • http://fedime.org/imagenes/ninotadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=galaxy+clusters+and+superclustersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 10652 bytes
SHA-256: 0f240ed5609af5cae15741cf6f1093f1cda58cf096060f729135da499cc79eaf
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 18312 bytes
SHA-256: 812923895336f27212d81ac87354d2a315d48f98f2b79f38a499c060ed80e2e7

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