Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6f00e91c88bec4…

MALICIOUS

PDF

88.1 KB Created: 2021-03-30 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c1ce87e43ba7f37e44b15ed75e04cb95 SHA-1: f49216d87abf44f93519a834290610de8c52bf07 SHA-256: 1b6f00e91c88bec4a919fa4fe50cc42d1d3e848868e4f1282ad7fcd80c462b62
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of the URL 'https://kuzutuzo.ru/strik?utm_term=understanding+chess+tactics+pdf' and the heuristic 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially malicious or deceptive content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=understanding+chess+tactics+pdf PDF link annotation
    • https://cdn.sqhk.co/neganobasiwe/fiamX0a/commando_4_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/icggXhf/free_ringtones_for_android_music.pdfIn PDF document text
    • http://jarisudowapebi.sportsontheweb.net/buderus_logamatic_r2107.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/cBgiigs/loud_ringtone_mp3_zedge.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/38jgYeD/counter_sniper_scope_2-_16x44.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/Kidgj3Y/feretuwubiki.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/2giMRcY/descargar_sims_mobile_para_pc.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/loteria_de_frutas_y_verduras_en_ingles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_308365f4b7d34f8395a0cd8f823f881c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bb260a-1b66-4738-bbfe-4a34ea93a599/lurupese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42e922a-ae62-445f-9031-ee50b08df738/how_does_globalization_affect_the_world.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/26392025958.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_0fc9d89548bb40fe9002f16a59efe432.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_355e22f30b944c56b70d4e12c59b6fdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb97ccb-ff0c-4a18-9653-f38dca8f7efe/famuwegibel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bfc84a-0efb-4d28-bdfd-26cef1d45a5c/biblical_hebrew_word_frequency_list.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_09205109732c40ee87586d5991e1cdf1.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_34c0ce897d024b979818803fcfdbd579.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_557fa5c5306642c58c583a5d70838071.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb33ee5a-3dff-4ba6-ba6c-5f71f8ed7d44/45915809883.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_19154510826a4272900d25b77a879ac8.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 5056 bytes
SHA-256: df7d229451bdcc56156e99509b101e9fdd26c610917026cc254474f15358131e
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 11868 bytes
SHA-256: 5f10e6c170e1e1e3086e8acc11f9619f273d4b81f1fcedc73ad9ef6317564089
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 16148 bytes
SHA-256: 333c6b7950143ef5b768b9d621755905cb9f9f437be433e332b6baa8edb2b5fd
font_03_sfnt_off0001446b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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