Malicious PDF — malware analysis report

Static analysis result for SHA-256 1391a72d0a8f02a1…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 19:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd986d584eb6bfc3163e03ede3d09581 SHA-1: e9fedc488347bd4d701fe47303b73c645ee64a9b SHA-256: 1391a72d0a8f02a1b6eff5f24e5aeac1bae17c01b58e2d18db57fbe9513652b5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Link T1553.005 Security Software Disablement: Disable or Modify Tools

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs social engineering tactics, instructing the user to disable security software and paste commands into a shell, likely to download and execute a second-stage payload from the embedded URL https://soxebez.ru/wix?keyword=check+port+cmd. The combination of fake security checks and instructions to bypass security measures strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Fake browser/security check with command step high SE_FAKE_BROWSER_SECURITY_CHECK
    Document combines browser or security-check verification language with instructions to paste or run a command
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://soxebez.ru/wix?keyword=check+port+cmd
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fed0192edfed.pdf
    • http://apparently-home.com/95656389115w7xy7.pdf
    • http://testertumentum.space/ecology_worksheets_principles_of_ecologyn8hqk.pdf
    • http://help-business-media.com/shimano_ultegra_di2_shifters_discinsei.pdf
    • http://vannabanyavsedela.xyz/61732698521yd24z.pdf
    • http://goods-amzon.com/dengeki_bunko_crossing_void_apk_englishzzg6p.pdf
    • https://cdn-cms.f-static.net/uploads/4448545/normal_60222473df6f0.pdf
    • http://steblin.pro/73728657291f7b6b.pdf
    • http://ecosbor.net/coleman_powermate_5000_partszaiaf.pdf
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fdffde783028.pdf
    • http://generatorsale.ru/88828873841hazni.pdf
    • http://vaxiliwu.medianewsonline.com/what_is_another_term_for_informal_language.pdf
    • http://adv-workshop.site/muzukifugejamekuzadoalcf8.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_600f8aeda2746.pdf
    • http://jotafitosixa.getenjoyment.net/fixolobifudevavime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ada1271-5710-414a-b224-f54ba034e8e2/gavel_toastmasters_club_bangalore.pdf
    • http://pasifowon.atwebpages.com/xusomud.pdf
    • http://rixigor.onlinewebshop.net/49825369658.pdf
    • https://uploads.strikinglycdn.com/files/f14d22b0-d913-468a-9910-11cad6b00861/taylor_swift_fifty_shades_of_grey_song_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/9d3a8670-322c-4c91-87bb-e1501dffa25f/city_car_driving_mod_installer.pdf
    • http://sajoveguduv.onlinewebshop.net/83935981346.pdf
    • https://uploads.strikinglycdn.com/files/a922934e-c4c6-4f49-8e7a-dbea6f3f5bf3/raxogixigutemibufam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc2.bin
2edfe47407a387e7e1b52ba4275dfe1db3fc0b0ba66154f81b20cfcd31c4f431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 4864 bytes
font_01_sfnt_off00010d1a.bin
1211eb77611777bf91fcf7e333bdacd072fc25c68742fe52633801ff64fe2dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 11068 bytes

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