Malicious PDF — malware analysis report

Static analysis result for SHA-256 31992ea0187675d6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70f78334db52fef5f19c64cf24477183 SHA-1: 5c94f6034b24961b457363ba572f70a09676d331 SHA-256: 31992ea0187675d6277406ecf71488ce34869e5ece2e706700b99ce3bcc3d263
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it is designed to lure users to malicious content or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • 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://snqrsl.quebec/upload/editor/file/puvigixi.pdf In PDF document text
    • http://gsmontaggi.it/userfiles/files/miwupil.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/turenerutigebetafazofi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vatitog.pdfIn PDF document text
    • http://sbairs.com/datas/files/28195877374.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/jagelimovijof.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/16500425504.pdfIn PDF document text
    • https://membermimpi.com/contents/files/fogofupovafujunipawe.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/13482697896.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/kizulikafaf.pdfIn PDF document text
    • http://apex-architect.ru/images/file/nuziperelanarijuserepela.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131cdc283202---20837714941.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gelunukidewazuro.pdfIn PDF document text
    • http://gewald.ru/content/Files/vuxejazusexupotipunixu.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/jewivebavoxumalupixo.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/jufoxowinawu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/36339906684.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/62995798122.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/naxukelutakejunabitez.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xujewesufadedun.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wifufiju.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xowisofokerufuno.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/sukapajurig.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/62868446490.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/25894907168.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/gofarakogurizofuwomefegaz.pdfIn PDF document text
    • https://goodline.by/userfiles/file/golulawivim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=famous+classical+guitarPDF 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_off0000bc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC23 10416 bytes
SHA-256: c70027c5119d35b7d04159aac9b8032700eda1d7e2b2aaae7474a59f7fc24c8f
font_01_sfnt_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 18004 bytes
SHA-256: f293c859363d4617ee3ce673688973bffc5fae1ff0fbaa18caa675ad26d66464