Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6520d624221e56…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 19:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4550f4cc11af844081730d5f86c3a002 SHA-1: 27a6e442e2025d27879f4cc20b4cdbd57052b70f SHA-256: fe6520d624221e56f6fbe07d46e7a4811abe58beffdac63901113e9b8f81f6d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings suggest a malicious intent to redirect users to potentially harmful content or exploit SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sudeoksa.net/userfiles/file/20210913192459.pdf In PDF document text
    • https://tsydesign.com/userfiles/jws/files/zitotataf.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/3140351689.pdfIn PDF document text
    • http://afslab.asia/upload/files/49799137139.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/3118640312.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/64851404829.pdfIn PDF document text
    • http://preiss.at/upload_files/files/besegox.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/goravolexiz.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/43253695043.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/rataf.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/68269510534.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xeboxux.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/tirixanukiju.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613912facd7ac---92451204599.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/50763687579.pdfIn PDF document text
    • https://limadelimon.com/images/file/27631498923.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/26931292389.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/41767986915.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/745385427.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/logojow.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/28059293074.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/15450463754.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/tileriminogariw.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalemorakapipajonit.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bafeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=como+saber+mi+mac+address+androidPDF 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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 10560 bytes
SHA-256: e5fa35242e800498269eef4f2c43ec6e52f39b5d22a8302fa4f71cc63515cd33
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 18664 bytes
SHA-256: 3c53db0570d16461beb7f6e159ab451d908a1a88193c80b5af16f73b9f5ca056