Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b9706db4b8a6c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f76be8fea542c705e0a1471cfcb47e69 SHA-1: 3b80a79b585c5171f9f160b99650cc3cec510df2 SHA-256: a29b9706db4b8a6cd0bf9172c9899fbbcd6df8f2762ee83d839e4611d2ac864d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate it impersonates a cloud document and lures the user into executing commands via the clipboard, suggesting an attempt to trick the user into running malicious code. The presence of numerous unknown URLs suggests it may be part of a phishing campaign or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/84673733298.pdf In PDF document text
    • http://nhactheducthammy.com/upload/files/50960332189.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/fakatazivikirugi.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/15307875304.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/8474829896.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dcf94e95---63602076894.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/66295831071.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nebisomid.pdfIn PDF document text
    • https://makenie.com/upload/files/41325141910.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/99286144053.pdfIn PDF document text
    • http://umhouses.com/uploads/files/53556836999.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/92084262105.pdfIn PDF document text
    • http://kaies.net/upfiles/file/63249868899.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c7682ad3c80a5726d7fb1238e5021dc/nesovaf.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ec3aafb04cf83f9673600ccecd050b6a/limuzikevuxen.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vusoxabekolupopoponu.pdfIn PDF document text
    • http://gro-felix.si/uploads/rakizurisijixu.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/wevevibafokozosaxo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/84935503354.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/valuxago.pdfIn PDF document text
    • https://dhesient.com/media/diwudumozizojutewuwile.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/bodiletuwomepubov.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/wijokivorejitevuzujujevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+lock+pdf+file+for+editingPDF 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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 16976 bytes
SHA-256: afbe173e9d31a8b4747682d76af8a1eaa707505e0aac4f8cf184369344bfcf79
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10632 bytes
SHA-256: b9c287f786f49d8e6473a7861560f9d2601d067e8d37c4c661f5ece76568d931
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1