Malicious PDF — malware analysis report

Static analysis result for SHA-256 5989068debd779bc…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 05:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 51d9c3125d4de2dd5c415feede873dc6 SHA-1: 4b23ab577f29cd44f4951758279abbb718aa4d97 SHA-256: 5989068debd779bcb138484a5c4324e1b3aea8042d7fceaa275a849505cc50bc
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 ML classifiers and ClamAV as malicious. It contains numerous external URIs, many pointing to disposable hosting, and exhibits characteristics of a link farm. Crucially, a heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. No scripts were extracted, but the combination of these factors strongly indicates a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=is+inkscape+for+mac PDF link annotation
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/basudilo.pdfIn PDF document text
    • https://lisajakuxateril.weebly.com/uploads/1/3/4/3/134349263/6332061.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/38075166861lha6e.pdfIn PDF document text
    • https://cdn.sqhk.co/bimazizuxu/gcghFhd/26603007679.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/gOiaVT3/magic_cup_dessert_near_me.pdfIn PDF document text
    • http://prizinsta365.site/myers_briggs_personality_breakdownlk7xb.pdfIn PDF document text
    • http://komarovskii.xyz/what_is_the_best_tracfone_you_can_buys3f67.pdfIn PDF document text
    • http://joy-todays.online/40813522954ds5i7.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/dihgg6E/hummer_jump_starter.pdfIn PDF document text
    • http://vir-tus.com/detroit_red_wings_charter_planeu2mxf.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/92b4c31afaf9417.pdfIn PDF document text
    • http://help-copyrighteamservice.com/how_often_to_change_oil_2012_honda_civic7p1n8.pdfIn PDF document text
    • https://nepuxobim.weebly.com/uploads/1/3/5/3/135304691/4669819.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/gdghigh/2_player_one_pc_games_offline.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/nulekegagovom.pdfIn PDF document text
    • http://chatik85939775.fun/amc_calendar_2021p975d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c80d865-f9ed-426f-9c7c-58f4e81dddbb/jinibuduvimavivafulepu.pdfIn PDF document text
    • http://kekunulu.epizy.com/6100954082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153eb8c8-0fc3-4046-979b-534e47ec6b47/how_to_invert_the_camera_on_windows_10.pdfIn PDF document text
    • http://karimelu.rf.gd/healthy_eating_guidelines_for_schools.pdfIn PDF document text
    • http://fadakivok.rf.gd/tajesepudijifamoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a68309-4e76-4fb7-b774-c4c250a63dea/dell_e6410_memory_upgrade_instructions.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://scripts.sil.org/OFLIn 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 5132 bytes
SHA-256: 917aa6fe94305634e83498968d439f0189b35b85965a2070a5667027577af6cc
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10756 bytes
SHA-256: 10e125aaedd5d07f5ac199b9104cf3016965b1b03440fe0f154d9f1bdc70ccbe
font_02_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 16420 bytes
SHA-256: 14012885139e322cee735bf1cbf25df4d6de00791e14160fda853b6ae8abdda7