Malicious PDF — malware analysis report

Static analysis result for SHA-256 50145b1f5084ab91…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 10:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d9bac7d92a7d67d413fef779a8c6097 SHA-1: bd5599222085b4c431e1509d823ad5439148beee SHA-256: 50145b1f5084ab91cf251feb66dec8f7b2994d25cba44c6c8ea3542a19df9650
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to interact with the clipboard to execute commands, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware delivery mechanism, likely involving the exploitation of a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://umrllc.com/userfiles/files/zobedug.pdf In PDF document text
    • http://mutamobilya.com/images_upload/files/68273986978.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/nopowonimagoxom.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/31751535147.pdfIn PDF document text
    • http://favourtec.com/attachment/file/xatel.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/zupeferesesenisipe.pdfIn PDF document text
    • http://donghotam.com/luutru/files/27929211848.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tuwapumaxisenegazow.pdfIn PDF document text
    • http://labonscafe.com/userfiles/fowufotasotipowef.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa581484c9---jimumim.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/19796632503.pdfIn PDF document text
    • http://labsshop.com/d/files/31200099470.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/81248319283.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nemobaguxanezot.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/taruzoz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l8ojc23hq034i5h95ee9atsk26/fopifiguku.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/kuxunusimekokemuleruwom.pdfIn PDF document text
    • http://web5gstore.com/Files/files/14033795935.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/vofijisufofi.pdfIn PDF document text
    • http://w-mill.jp/images/file/26389423824.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210913113647.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bavizewolijibizike.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/gebakudatuluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=reboot+fastboot+adbPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 17692 bytes
SHA-256: 6f4616f4f3454e0ceaf78dd7ee7298c171792bdfacc20c3949dc9f001fe224c4
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 10188 bytes
SHA-256: 95da4d6bbcfc84c2c631882e47ffce0e3de41da0ebe8e32aeed42a7c5d529510

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