Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e8e13a3fd8fcdb…

MALICIOUS

PDF

77.2 KB Created: 2021-04-16 13:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1908a9ef02e7f46f70dcfe87d6290ada SHA-1: b07f57827f172de29a2b3e9ff4c888c5271733fc SHA-256: c6e8e13a3fd8fcdb96b6f7d91412528ceb9f77d2b4570877cabb329e06e21262
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'whirlpool lid switch' and 'wkhtmltopdf', suggesting a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+remove+whirlpool+lid+switch
    • http://nuzabokazovuwa.iblogger.org/jovodezaxegido.pdf
    • https://cdn.sqhk.co/sidamebo/eBmBkhi/british_history_william_the_conqueror.pdf
    • http://sezowevefekaga.22web.org/79591100400.pdf
    • https://cdn.sqhk.co/reriwoduriju/qjaeQD2/gavugaduleto.pdf
    • https://cdn.sqhk.co/tafolaku/hLZhjgc/49758639845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_b94ab69682894764ba9db15665eb48ad.pdf?index=true
    • https://s3.amazonaws.com/sixolose/81174423177.pdf
    • https://s3.amazonaws.com/sumesawoxajew/the_best_ice_cream_makers_for_sale.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_7d490b552b6e40e0bfdaab0a81cd56ec.pdf?index=true
    • http://lipidojomodu.rf.gd/sojiwabekatasafidezituseg.pdf
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_7196915f6bff48d6b923001e95b46c97.pdf?index=true
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_1d7530781bf7467ab8a0b3502d0b8d5c.pdf?index=true
    • http://pujeriv.rf.gd/numeros_romanos_del_1_al_10000_completos.pdf
    • https://s3.amazonaws.com/loneminovu/how_to_make_android_21_xenoverse_2.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_57c49f4af3a848a3a784d3c74bad6bb9.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_ae4891fe1d7244dba7330270d2e7b6ad.pdf?index=true
    • http://rusuxagek.rf.gd/guia_de_adestramento_para_ces.pdf
    • http://fukutinupamebo.rf.gd/answering_machine_meaning_in_spanish.pdf
    • https://s3.amazonaws.com/kotodur/will_netflix_release_a_series_of_unfortunate_events_on_dvd.pdf
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_cbe8d6a2ecf7496da5292b482bb90710.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_aa1d37a10c5d46bbba5a7276e1f252b9.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_off0000ee01.bin
61146abba1ff4febd89a718674f9dfb94972512d0fb9db027790232255e48935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 5216 bytes
font_01_sfnt_off0000ffae.bin
269d4abaaf79ab9a345a0438b22d70da4209c483aa72f805b8c2696f4ef2b72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 11836 bytes

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