Malicious PDF — malware analysis report

Static analysis result for SHA-256 c165d48a3a6aad33…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 07:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b85765ae0f3ab9e177792f2fe47e58a SHA-1: c04545fc07147cb87277c17f16ec37c714044660 SHA-256: c165d48a3a6aad33fde75aaebd9edcdf646359057c4ad92ccc187925b8ad5c7e
174 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a lure for a password-protected archive, intended to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rossbeede.com/userfiles/file/dixokemazuvubiligedakife.pdf In PDF document text
    • http://retailcop.ca/files/23569310347.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/69413259645.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nuzutajor.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/752f2422ff3b265651cbe76037707885/risuxoletarebavodelokopo.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/151924548.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/dopesiw.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mosetinulonutilarepokuti.pdfIn PDF document text
    • http://tcihk.com/userfiles/tefudegisalasewamuto.pdfIn PDF document text
    • http://erpos.sk/data/files/20563180582.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/dufosigodozufuro.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/71245693504.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/xedozifiranipavubinag.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/39627173565.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/31752329299.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xiwulomuzifalujumol.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409186b50d3---banevod.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/zoxubokakatad.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/3492843093.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/4957611362.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/10038419626.pdfIn PDF document text
    • http://dzerzhinsk.timebank.ru/sites/default/files/photos/pagefile/bejofojuxozivafob.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/53626835702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+cambiar+el+proxy+en+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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10796 bytes
SHA-256: 5e2ce2e10f468ce2fc318af3733d26919f2a4e17225a1d3cedc880218a26e389
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 18320 bytes
SHA-256: 0c8fe75a15c12b584ccb18769a3423f46989bb206138bcecea84472097feea1d