Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8211a8213e0aed…

MALICIOUS

PDF

89.6 KB Created: 2021-09-10 06:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d1d515b77eeff960324a719b38280ef SHA-1: efb51a7e7bc2e505888fb92a4ef610e389d38d2e SHA-256: 5b8211a8213e0aeddd52927103b339f4a1508368a0291d1e75272de87496986c
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to interact with the clipboard in a way that suggests command execution. This, combined with the numerous embedded URLs pointing to PDF files, suggests a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krantiservice.com/ckfinder/userfiles/files/godekerorujo.pdf In PDF document text
    • http://fc-junajted.com/upload/datoteke/70081638447.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/59211589425.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/91928224299.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/wemamazimunefujebugufat.pdfIn PDF document text
    • http://abc-tel.ru/data/File/72296696234.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/rilejuxij.pdfIn PDF document text
    • http://104408017.linker.tw/files/18537750939.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/rijak.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/potenajiz.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/80225363001.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613880868c4f7---kafabimali.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613693d2e1f88---88306260606.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/sivigojiweg.pdfIn PDF document text
    • https://motoralbini.it/files/file/9788471155.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/70999717333.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/roneriwifulisikafuvubibi.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/4967476078.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/wumipiz.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/bojiruvirematapedilarozen.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/wenemegebato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adb+bugreport+commandPDF 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_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10772 bytes
SHA-256: 4d5387b7b65590433a0a51ddfe18f510a1e0a11288e7baa864610fbde40ce5d4
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 19520 bytes
SHA-256: 48fe6e35f12f0f7ce75e09c4673680a3c661be2e50a19b6ed5ea684a23301c34

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