Malicious PDF — malware analysis report

Static analysis result for SHA-256 937d060722872115…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 20:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb82bdc3d48363d623b5af32f0c30047 SHA-1: 52ff2a0d08497055ea38cc28f507b580960feb01 SHA-256: 937d0607228721154c295ebaeab579fef5866c991ebdf1dcf9f8e97e00a4c700
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document is designed to trick users into executing commands via their clipboard. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://propiedades.net/ckfinder/userfiles/files/91694290153.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/juguke.pdfIn PDF document text
    • https://turbooto.vn/upload/files/xalezorelesati.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xefomif.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42920224783.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lodevufejexom.pdfIn PDF document text
    • http://gnox.vn/upload/files/41793995511.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/62e63ad3a589d4a3dea1f4f2db19c029/39429060231.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/vekeguvolud.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109121702157643.pdfIn PDF document text
    • http://newo.ru/files/files/1189731240.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/fazosa.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/luvotu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131072a74776---75554076085.pdfIn PDF document text
    • https://sim2007.com/files/20234962359.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/911676295.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/pumajigomevi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/31744043110.pdfIn PDF document text
    • https://wonkingchina.com/d/files/41132291920.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/dadenajunumudufifuxuzodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+open+android+studio+after+installationPDF 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 18768 bytes
SHA-256: 2fdc79790a645bcbc486c1228d67dc46494edadba6e8989b51f680bc0a365c9e
font_01_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 10668 bytes
SHA-256: 3db1dc1fa2db59810907786412bbf5cfa683606e08ed09487dfed38fdf4f10d8
font_02_sfnt_off00012b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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