Malicious PDF — malware analysis report

Static analysis result for SHA-256 521d9fb560c25679…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 17:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 378796ec5440b3367ff1821cfeae52ea SHA-1: d07869a23e8a106dd71fff55d0099663e875cc72 SHA-256: 521d9fb560c2567931034d70d013c29beb373a6e97d14c0d255de872545ff5d5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, directing users to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=alkanes+list+and+structure+pdf
    • https://cdn.sqhk.co/mofinopedas/hfy3jgd/mini_golf_near_me_open_till_12.pdf
    • https://cdn-cms.f-static.net/uploads/4488555/normal_5fd79b830be84.pdf
    • https://cdn.sqhk.co/gutejalajige/ZhbQmHS/53504335140.pdf
    • https://cdn-cms.f-static.net/uploads/4403413/normal_600f7aeb77e5b.pdf
    • http://trells.space/battle_angel_alita_2_imdbi8brx.pdf
    • https://cdn.sqhk.co/jamasedese/amjjiAn/easy_vanilla_ice_cream_recipe_without_machine.pdf
    • https://cdn.sqhk.co/zumufapofow/gdgePoh/the_ice_cream_making_games.pdf
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fce8850ccd23.pdf
    • https://static.s123-cdn-static.com/uploads/4417025/normal_600206283282c.pdf
    • http://mugedly.xyz/ego_lawn_mower_battery_life7e463.pdf
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdf
    • http://yogait.space/sobejagox14xh.pdf
    • https://cdn-cms.f-static.net/uploads/4412894/normal_60489e3007f32.pdf
    • https://static.s123-cdn-static.com/uploads/4405922/normal_5feb3254bea69.pdf
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5fd391d708d9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_eb91fabfa3c142859ce0a370a628c894.pdf?index=true
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_dea7e2e7df4643ef9476d2ef851aba03.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_ed710f2ddfdf417184c07dcafa14284e.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_b4f574d2f3a3400b900d72d2a51867b9.pdf?index=true
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_d2ea3e3b572f48488a7ad32c9479c6cb.pdf?index=true
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_6990ad25a3ac4b9fafec9a0df2847a33.pdf?index=true
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_22b0f6e6d87f448ea8ae9fa611043684.pdf?index=true
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_4085144fb11746af9747887677fe8747.pdf?index=true
    • 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_off0000f5aa.bin
df7ce8cc1551641b965a49227c0b3e5304abd9fb08a8c3941c2ba47294327863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5200 bytes
font_01_sfnt_off0001076d.bin
d969fe7c10b6372a5d317eda1f9ede986324561484439e5efab952ef3faf2d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 10452 bytes

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