Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4229fddd91e938…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 22:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d67ffb29e9f50017bcfc31622b5bd194 SHA-1: 9d16a9f0fb541a7db21a2b607695a6103958abd2 SHA-256: fe4229fddd91e9383e881e349628f5e85f945f0def4ae55be4ec345197138802
166 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links and exhibits characteristics of a link farm. Notably, a heuristic identified a 'Clipboard command execution lure,' indicating the document likely instructs the user to copy and paste commands into a shell, a common technique for executing secondary payloads. The presence of multiple external URLs suggests a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cructi.ru/uplcv?utm_term=flutter+for+chrome+os PDF link annotation
    • http://lafenicealcamo.it/userfiles/files/jukaxoxevilitugizokefixe.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/50895193922.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/49312330539.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/10218759832.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/fikimulixebafel.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/35483938369.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/19706759995.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/sozujosowetogez.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580bdccaa6---nalopik.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/revawujotinawomubule.pdfIn PDF document text
    • https://vendax.ro/files/file/92766808358.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/22545801896.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/xobajadaxunokani.pdfIn PDF document text
    • http://generaldistco.com/images/file/84952854253.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/54469257132.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/88516965721.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/balune.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/91647681836.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/13249564950.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/25021876043.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/74094912062.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/54711603873.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/47130087780.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/vixepokoribegidolesuzitel.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lased.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_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 10320 bytes
SHA-256: 2959ce25686df89623e2f158cb91159139c177951a8049ebbabe2c6135386033
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 18356 bytes
SHA-256: 842ac405fc88692ba33cfe6a3d5dbe1ab2d7a08d0e59e22981cbe0faf0f537e1