Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a165e59ecf6cf0…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 13:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1642d4a042e265609827094b953c815 SHA-1: 5f8e45c8f625572ae4a8c328b38b16d856e083d5 SHA-256: d6a165e59ecf6cf078bcea15671fb192deeacc91223f839fe2b96ae95650b7fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or malware delivery.

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 http://restauraceeverest.cz/userfiles/file/64457928088.pdf In PDF document text
    • http://allier-genealogie.org/File:/12543518743.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/714089601.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/mogukuzuvigipidazufuwuz.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/xikoronow.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bakanesuginurutod.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/41553224392.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/91940425403.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/65075092893.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dixasonugabuvovodetug.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/18501427662.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/49938512879.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/mevigub.pdfIn PDF document text
    • http://epicridesnepal.com/files/mejebosazisamemamule.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/88505224739.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/zorozapafone.pdfIn PDF document text
    • http://cpils.com/userfiles/file/9902308514.pdfIn PDF document text
    • http://gaudi.tw/upload/files/55042841932.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615814e911172---zabupigaz.pdfIn PDF document text
    • http://parfumland.sk/upl/jozuw.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16146884a82617---15091199121.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/fasuruba.pdfIn PDF document text
    • http://schokozentrale.de/idata/newofenivikav.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/rifobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=from+pdf+to+word+appPDF 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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 15328 bytes
SHA-256: ba093c63b8fa73b921c1ed2bbd793bdf0767dd14f09223845c54772074ffaee1
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10180 bytes
SHA-256: feec23acb9dfefbd3264044b1a3f65f56190a3bf87d1e978c3c5cc6cde269410