Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d31e591a389fbc…

MALICIOUS

PDF

71.3 KB Created: 2021-03-25 20:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7102551053f8def71688dd1e118e162 SHA-1: adbd1047fb5bdd9a3647001f3bfaa657acc6a78f SHA-256: f2d31e591a389fbc2e5c22069cd0c5c2d9a3ad2870503c6337ceb6c32da0f52f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic identifying a 'mass external PDF link farm' pointing to 30 other PDFs. Another heuristic indicates the presence of LOLBin tokens related to PowerShell, suggesting an attempt to execute commands. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://kuzutuzo.ru/wix?keyword=live+oak+elementary
    • https://cdn.sqhk.co/jolodovi/ZTjj4ie/selfie_queen_social_star_hack_apk.pdf
    • http://nuvemibopakukot.22web.org/admission_list_unilorin.pdf
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/c5713.pdf
    • https://regofixaf.weebly.com/uploads/1/3/5/3/135318676/38327f311be9.pdf
    • https://cdn.sqhk.co/tosuwukiwate/i1hfkhi/vexed_crossword_clue_11_letters.pdf
    • https://cdn.sqhk.co/jurufovowufu/jebygeW/jokis.pdf
    • https://tomudonaki.weebly.com/uploads/1/3/4/7/134715401/bobixotemekerogelomu.pdf
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/wibojatav_xalikupudajenaj.pdf
    • https://cdn.sqhk.co/kigimole/UAXictf/download_wordpress_theme_from_another_site.pdf
    • https://cdn.sqhk.co/tinulafi/ighjd4D/hill_climb_racing_2._3._6_apk_download.pdf
    • https://regofixaf.weebly.c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/16a449be-8f2c-4af3-bdfe-7ca816d6a0dc/ponoxefobinerubodovikare.pdf
    • https://s3.amazonaws.com/mixanaz/makumapewalawakikone.pdf
    • https://s3.amazonaws.com/paxunu/43621717631.pdf
    • https://s3.amazonaws.com/vuzufexarevima/air_supply_songs_album.pdf
    • https://uploads.strikinglycdn.com/files/d6f27c08-5f3e-467d-b635-f50986c55797/windows_powershell_script_not_running.pdf
    • https://uploads.strikinglycdn.com/files/d4aa356c-e5d0-43c7-85fa-df1dd0962968/pozidupijitujabodasonuw.pdf
    • https://uploads.strikinglycdn.com/files/4092130a-4dd6-4317-bacb-ecda33495df5/1484907057.pdf
    • https://uploads.strikinglycdn.com/files/e46ca603-6c27-4a47-b715-f2036ed4d83d/el_mito_de_la_caverna_de_platon_opinion.pdf
    • https://uploads.strikinglycdn.com/files/5bf68741-3509-47d8-991a-588347b5e0fd/is_comptia_cloud_worth_it.pdf
    • http://wasupudunufol.rf.gd/48384806130.pdf
    • https://s3.amazonaws.com/mubemutolewe/angularjs_formdata_append.pdf
    • http://rufujomuxa.epizy.com/18938011955.pdf
    • https://uploads.strikinglycdn.com/files/8eeb2c47-2929-424c-a4c9-0e50c8edeb9d/nazalisawalugixusu.pdf
    • https://uploads.strikinglycdn.com/files/104ec08e-d9d5-426a-ab98-7a0879d010be/lewag.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_off0000dbb7.bin
5a314780aa603bb201bcc9ba555354f1c22d01c6a853bb28a8ae472e80340815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 4820 bytes
font_01_sfnt_off0000ec16.bin
f44d89b6e4377c7932f04b52b1bb13e66bd436bc852543c018296fca1c8228c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10540 bytes

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