Malicious PDF — malware analysis report

Static analysis result for SHA-256 8302e20d4dfcc7db…

MALICIOUS

PDF

82.4 KB Created: 2021-04-17 00:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6e0b9582d406ffd9b3ece29998719a7e SHA-1: 94fac172206ee10b9effcfc1ab1c7b24de4662b9 SHA-256: 8302e20d4dfcc7dba0f7987d4dec449bda7a1b7a1236e801d3b40cfb917b32f2
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or conducting phishing. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=omron+hbf-514c+measurement+log+sheet PDF link annotation
    • http://nonretloli.site/what_time_is_walmart_black_friday_sale_start_online8p5lf.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/y3jjfhh/papowaganozixovag.pdfIn PDF document text
    • http://wopizup.mypressonline.com/88968174839.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/60662072026.pdfIn PDF document text
    • http://ibkreactiva2020.com/how_to_get_an_ethical_hacker_certification8km5u.pdfIn PDF document text
    • http://cosmeteca.com/eesa_vb_mapp3owv1.pdfIn PDF document text
    • http://tehnopolis.org/manualidades_de_halloween_con_material_recicladofznox.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/bgeSpig/19621324117.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/Knhhjip/pilagasa.pdfIn PDF document text
    • http://eroganoficial.site/xiguvimelazanedemumuk1pdx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_4f6f5f671dbf4300b2830eb4fbd6ef69.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/learning_management_system_design.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_7c02b04d1df94453af88872323d50a3e.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_335ccb661a3f445c87c77deed1533693.pdf?index=trueIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_508b728c3d93424c87e686d2bb3585f3.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_85aec559610847a1901f8aa5969b3ba2.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_8bfc373332e747b587c0233d3b85025e.pdf?index=trueIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_dd5a4f7cd81347bf81435f88d4e5c343.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_35b7c4d65b7f41fc8bfa64abf961d135.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_46ba70ca5df948ceaac0d27aed689e11.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_c08d8b613a9c44b3b5e103a1ccd1727d.pdf?index=trueIn PDF document text
    • https://7e62deb9-9b1a-4e2d-8b60-9a8f762ee201.filesusr.com/ugd/1f553f_2d8b32ed9cb446ba88c97ceb144520c7.pdf?index=trueIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_88aa106658bf41cb910b530771f6e63b.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 6232 bytes
SHA-256: 577a22596097df3dee7921aeaf85f15329de2bf5ab29932fd7012c843bb60eaa
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 5760 bytes
SHA-256: 99ff2627424791b0af7025ca9f2d657991e2fe19a589e0151e8e1d83520e27e1
font_02_sfnt_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 11364 bytes
SHA-256: 0f71e18d3b1eee42be1067a8285d1eb32f980ca740420f12ab23a560ec0276c2

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