Malicious PDF — malware analysis report

Static analysis result for SHA-256 56510fbfcceedbc2…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 06:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3231413fdfd51e837c57f8e6c550567 SHA-1: 5e2b1fdbc8fabd6c4a9dd84b7e29db38691eba60 SHA-256: 56510fbfcceedbc296cb9bfa123060ac4467eb3121ec212e2443e7b01d1e71ab
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting an attempt to redirect users to malicious sites. The presence of a disposable link farm on potentially compromised or disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sicompk.com/survey/userfiles/files/xemevefegorovisatakiso.pdf In PDF document text
    • https://zaragozadenoche.es/upload/files/8810198996.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/99137063757.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc8b8e4ff---fanibefufibemirinopozuxog.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vixanujewidepoxudiredoje.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/natozilopid.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/najerezerixagewovigebok.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zepabexa.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/kudorugu.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/57952734236.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/6163957670.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/5713637253.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/20142333411.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/fulowovezibar.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210904130657.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/96208179236.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/52893456156.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/vowerukulowox.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f4ddbfbf---39921118738.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/95947149027.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/jibamanubiramotafin.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/kusoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pearl+harbor+full+movie+with+english+subtitlesPDF 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_off0000c5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D5 11056 bytes
SHA-256: 0f0bbd87051431bdd149bfd85acba0edee78895a60f48f0b5c7ae4643f37f8ae
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 17304 bytes
SHA-256: a4b7d596e281fce20c7fddcadac8f577ca86361d229fba7d2b6d36a5c69ea8de
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1