Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0634b5790a973cf…

MALICIOUS

PDF

70.6 KB Created: 2021-03-19 14:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3a29e29ba6a8e83268aca05880f4ed08 SHA-1: d756764497ed50e68cb04378fec9e70a73b36b1b SHA-256: d0634b5790a973cfa9035ebf198ed296a74080fa37144c16f40d22d12f53016e
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://jottigo.ru/award?keyword=termo+de+assentimento+livre+e+esclarecido+pdf PDF link annotation
    • https://cdn.sqhk.co/gudijupimeb/digjjDC/banamiloj.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/bescherelle_poche_anglais.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/i8Mgsje/dusazolaxerexeluvu.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/bhe2MWQ/fight_king_vendrick.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/ehaRahe/44814170694.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/accounts_payable_and_receivable_process.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/gjhiynQ/ant_factory_max_level.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/commercial_real_estate_lease_abstract_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxalisuj.rf.gd/android_games_news_website.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_2657777b14f346f6ad1dbfb6648cded0.pdf?index=trueIn PDF document text
    • http://tumofif.rf.gd/29222999401.pdfIn PDF document text
    • http://fezilavitaj.epizy.com/yaesu_ftm_100dr_advanced_manual.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/4614928848.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_86932856c20649d78da90d0586b12ff5.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_f83c64dca58945a8a469cae5f126b8c1.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_f26cf0363db0426daac441ba5518a091.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0eddb5e-8792-46ae-b4dc-29c2484cb118/samsung_rf267_display_problems.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_d33f1539ea954a0daf6f58776053b520.pdf?index=trueIn PDF document text
    • http://narakeke.rf.gd/18571523470.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_7d2dfcad34304e70ae8e3ea1ed298315.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a82171d-e55d-4b49-9c23-e83ae08df36b/43603923914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d366c3-e742-4bca-9d29-203ef5474022/13216532880.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_731a210ca8854355880615ee6b6ad726.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_e4b5bba556bd4cde9b6b7833b6f5c23c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 5312 bytes
SHA-256: e32339d0709bde56e60dc72be4cea2e0ed6536f07da1bd5583aafe61b4fc59b5
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 11976 bytes
SHA-256: e7f94389706c0b60acdf9956d89888a58f1f54b1e76bf84eadf0dc8c21609ef7

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