Malicious PDF — malware analysis report

Static analysis result for SHA-256 932903d72af1a04b…

MALICIOUS

PDF

83.3 KB Created: 2021-04-05 17:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b28944927252ec7d0d36e61ab0d8566 SHA-1: d033668e630f5c6a3c25d472d11670d21a0e28fb SHA-256: 932903d72af1a04bd64e1ce24cc35d3918047605403a5800d65a2849911140b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The embedded URL 'https://kuzutuzo.ru/wix?keyword=stickman+war+3+hacked' suggests a lure related to game hacking. ClamAV and an ML classifier also flagged this PDF as malicious, indicating a phishing or trojan-like behavior. No scripts were extracted, but the presence of many external links points towards a redirection or content-loading mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=stickman+war+3+hacked
    • https://cdn-cms.f-static.net/uploads/4378845/normal_60256c151bc9d.pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_605f7378b08ce.pdf
    • https://cdn-cms.f-static.net/uploads/4372371/normal_6035b3bccbacc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tutasujal/raxujegemuweguzo.pdf
    • https://s3.amazonaws.com/wurivuve/24965897505.pdf
    • https://s3.amazonaws.com/difigomisosak/el_caballero_de_la_armadura_oxidada_preguntas_y_respuestas_del_libro.pdf
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_8474af15a9934c7185328890dadb700c.pdf?index=true
    • https://s3.amazonaws.com/desenaz/marathi_actress_photos.pdf
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_b1d1732c830c4bc7a94b98c06674bf48.pdf?index=true
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_a8ea8a711a764b6089fd8c3b0b1c04a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dee16daa-0db8-4b8f-989f-3b8987291742/how_to_motivate_yourself_to_study_quotes.pdf
    • https://s3.amazonaws.com/tonisefoteka/aashiqui_bengali_full_movie_filmywap.pdf
    • https://s3.amazonaws.com/vanatul/tepekafe.pdf
    • https://s3.amazonaws.com/savukojubusum/13311027808.pdf
    • https://uploads.strikinglycdn.com/files/16a697be-2388-460c-9637-ba4da52359de/85898670771.pdf
    • https://s3.amazonaws.com/tafogusegabomu/bahama_breeze_nutrition_menu.pdf
    • https://s3.amazonaws.com/foneniz/report_lost_drivers_license_ny.pdf
    • https://uploads.strikinglycdn.com/files/3e7a5f3e-bff3-490a-8be5-5e728b42c0b1/wureru.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea66.bin
89ff600a3dfe464ec6f5de183ade9fb76adb776eeefba26d90298335575beb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 5072 bytes
font_01_sfnt_off0000fb66.bin
8396707103d22b0241971e938f22a1e7c8a0c076fc291bc039ec264dbb95172b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 5960 bytes
font_02_sfnt_off00010ab2.bin
98a4de691fb540841f09105921629f8953577cf95b8229b210ac93526851d16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 12228 bytes
font_03_sfnt_off0001319c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 4324 bytes

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