Malicious PDF — malware analysis report

Static analysis result for SHA-256 933f01c29627c6e6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 12:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de59bbccf5f87d59c434ff4235929a50 SHA-1: eeaf353506b7ddc1e414058effe193c0e40f1632 SHA-256: 933f01c29627c6e6f73a7e88c73eb045075e7bec0e0a5dd86a50af228d3027df
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and multiple external URIs, suggesting it is designed to download and execute a second-stage payload. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=kali+linux+cheat+sheet PDF link annotation
    • http://hastensandbreakfast.nl/userfiles/file/vubevaseluradusujo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mb2j505kij9b96i8kbmf2r52qi/pajozezunososenomepemo.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/30720037980.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/kemagiwobujimekasuma.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/puxufaliwada.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/kofazipimof.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/48537317659.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/52384126563.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/28843535700.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210908065944.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/12581635155.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/93311852429.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vixevunopovoxa.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/gigox.pdfIn PDF document text
    • http://abwessex.com/uploads/files/labajolozaxivusugu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/42361097111.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xagiti.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/medegolamoxagotimenedosek.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2aec738c---toripivejojibol.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/kodimajerisufipufevunim.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/41130528445.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_022933.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/23917399171.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/tudewewivifejufesovorena.pdfIn PDF document text
    • 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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 19364 bytes
SHA-256: 7befb85ba9d9b66a2b2e073e21ccda22f85e4aa41e91545fbaa36bd5ae8b1438
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 10300 bytes
SHA-256: 25b29524d957b3ef17d65c2f56ff4406410390717207bf070f5d1795b45ad674
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1