Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59196ec1f01b78c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b85ee2c4694372010f744c1f5c7c9271 SHA-1: 81cc6cd5bad71ed3e935f4063750b71bb3c861f0 SHA-256: b59196ec1f01b78ca76543aa577a60b7d0c3f6b82597877486c2a6642eb98bd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=double+click+to+lock+screen+android PDF link annotation
    • https://baglab.pl/galeria/file/76219629779.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xavidebubaxesukowavig.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210915225933788639kvolpnbsccm2.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/58521711785.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/41062684473.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f211bda9f6---69249484438.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/3916995707.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/25599510255.pdfIn PDF document text
    • http://elsped.hu/files/file/61670790654.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/62375937532.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/30908217157.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/83173676019.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wewel.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/lagozapok.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/23871206967.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/jerefi.pdfIn PDF document text
    • http://posuni.com/userfiles/file/luwukof.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/49865796545.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/39233969063.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dojifejugakowojew.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/91375704227.pdfIn PDF document text
    • http://headrepublic.pl/images/files/fafiravogojuvikitifem.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0cc70ea7317833974c75c5a1d869dd4a/80548462120.pdfIn PDF document text
    • https://mar3ol.com/Files/files/duvolemovabizariwugomab.pdfIn PDF document text
    • 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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 19128 bytes
SHA-256: 04a330dbc02a19ffe7920e32ff5d205e62cfa272629570c3e33ea38803af8a82
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 10696 bytes
SHA-256: 816f462852a2d35f2c672f5fcc87e3ecec9a0717a42884bf3bc13c02a2a4a7ec

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