Malicious PDF — malware analysis report

Static analysis result for SHA-256 85925f97b88b56d7…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 19:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af934de229a79f16a50760b4ab1c3bef SHA-1: 0dff5a1523137fadc8fcf1edb871530ec64c35ff SHA-256: 85925f97b88b56d7b092f6f454f4ad795e25fee3d774940d0f590da2a4f1e8cb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://dellalontra.it/userfiles/files/47514380154.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6c6cf769---bugepovafolenawubozo.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/netagivilesoz.pdfIn PDF document text
    • http://888chji.com/userfiles/files/48263492699.pdfIn PDF document text
    • http://ccadl.com/files/20210908085246.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/jexomosif.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/45391363647.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/nexujusirurufixorejinepiw.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/49379156875.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/getosipo.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/sisoxodisobak.pdfIn PDF document text
    • https://songhong.info/userfiles/file/55759588713.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/71969769881.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/roleso.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82003917430.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/putebezevurog.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/967180567a3dbd0aaf33c2f42eb7d46f/47709911967.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/muzojujagudes.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/jidavimuz.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/81518222026.pdfIn PDF document text
    • http://jucal.es/images/file/loliwopasepagasulavifag.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/zesinesironabut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+max+apk+2021+downloadPDF 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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16824 bytes
SHA-256: 709bbc56080b9964404c9bb890edbe27754105e336cfe7aaab801bb7fd000330
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10944 bytes
SHA-256: 26ab6ead9358f3ad8a576a445da115b20381a74733c097f67aab0e63c78202c0

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