Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcc0bd6a27d2a25…

MALICIOUS

PDF

82.1 KB Created: 2021-10-17 07:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e626cb6d78094a82b882d3fbe184f530 SHA-1: 40f845fdc64257708baff17ea0b795b961687abd SHA-256: 6dcc0bd6a27d2a25b6b5571b95fce542fefb4ba7d4d53b709d91825cbb5ed284
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs and a heuristic firing indicates a 'Clipboard command execution lure', suggesting the document instructs the user to copy and paste commands into a shell. This is a common technique for downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://masterref.ru/editorfiles/file/98258988546.pdf In PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/24029072328.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/52774503005.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/99713875573.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/28110801557.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/befopukekaxeta.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/tizixogidipadutenaxa.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/96096057648.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/sakomazeribalo.pdfIn PDF document text
    • http://dominant.name/userfiles/file/fodixotisexuxinid.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bugalaja.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/rokubinad.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/75213935612.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/vopezejugewa.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/32828889594.pdfIn PDF document text
    • http://rongqichem.com/upload/files/76853017723.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/zitekujazisof.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/dafigogukolupip.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/97286655869.pdfIn PDF document text
    • http://showdoimovel.com/files/files/25034390412.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c29971ec4---2990023864.pdfIn PDF document text
    • http://hainfelderteich.at/42771946616.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/fejipojad.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/sosej.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=mac+pro+owners+manualPDF 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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10524 bytes
SHA-256: 2a069f2e9e96091476f2af66cd49af8dbba5c47527c920cd9da91204519f0f24
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16480 bytes
SHA-256: 9a926f8f6434dad8817bf037abd63bab076391d7ad6bd168f605229a4a018121

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