Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd9904870e7279d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 08:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1e9dc845cc5bf3b516762c8cadc4158 SHA-1: 37d9da01b5ffe1e1c6c81bba3e9203ecd056a9c4 SHA-256: efd9904870e7279d577d84bec40694e0760d09d0572e390094359249e08fa438
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to potentially disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://galsabino.it/userfiles/files/49330594090.pdf In PDF document text
    • http://lso-msm.com/userfiles/file/46539008448.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kuwusupafo.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/bidaf.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/65098128687.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/22240399632.pdfIn PDF document text
    • https://ottopianos.nl/files/refoxovarowurisage.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/83289783591.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/18219631448.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/89891882798.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-21/20210921122152679553.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/42931391796.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/35766135085.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/xizufesak.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/zoninabem.pdfIn PDF document text
    • http://snsi.jp/image/news_file/taderatal.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210906024541.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/29064445212.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/rapabofol.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/13191736310.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/72263607396.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/15705528866.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/rozetafa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4a011bff---votononisobufibupenilana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+do+you+get+if+you+mix+blue+and+purplePDF 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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 17976 bytes
SHA-256: 0f351420bb2e2ada6e5af88c0944196f0626562af507d03a7228735da30ec156
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 11224 bytes
SHA-256: 08480f8974e8d265022346d6fe636f1188a988d29e6834d1b70e60d378e411e2

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