Malicious PDF — malware analysis report

Static analysis result for SHA-256 5313d4af15d14197…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 11:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83af2cddbf2552e21dfef34575be6287 SHA-1: 57a61d98d46d55502d87a4bb7af7f8c3f767e862 SHA-256: 5313d4af15d14197b7d7fdecd798838faf7bdfc847eed79a2f5b12f4b95b2d48
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The PDF structure and the presence of external URIs indicate it is likely designed to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kanomax-nsk.ru/images/40695584936.pdf In PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/89517526726.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/35927531047.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/xuzigokololunowonigepen.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/25108694621.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/36980011530.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cm8nb2a1cr2gncdovr1kik5487/76441768551.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/xupipapodato.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/tipibifoxadi.pdfIn PDF document text
    • http://balticstroy.com/uploads/files/riwozodu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613810417bc96---94324640279.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/31700385755.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vibox.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/8490464638.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/pidelederexegadaw.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/kujeselova.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/joxexatobafo.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/88020193190.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/vezozoguxujok.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/sizeda.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/83564147053.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/bopilod.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/rireruxazimefad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+keyboard+apps+for+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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 10672 bytes
SHA-256: eef47f1797d21796c31c42d12cc9468e508c435e823a8d142acfd0cd6aafb4c8
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 17116 bytes
SHA-256: 9291a53e98af5bfd77e4a20cebc5ff7ea158eceed24733d10c0f946ce57a7319

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