Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a703dd7353401b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-26 10:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4ad6147653750ee61fee61d83eccca66 SHA-1: 778a3113d8ecde5686a4ff49e4495347589f8e4d SHA-256: 19a703dd7353401b13320597bc71cb78c7b97349fc9e64fbb4120eacc696d1ed
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or redirection mechanism for malware distribution. The document body, though heavily obfuscated, contains keywords related to pairing devices, likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+pair+jbl+flip+4+to+iphone+7 PDF link annotation
    • http://tikovg.xyz/8824284772tomm5.pdfIn PDF document text
    • http://hargotel.xyz/why_is_the_naturalization_act_of_1790_significancepyh2z.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/VjizVH3/free_pixel_dungeon_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/icjamjg/46792436892.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/btvfNur/el_estilo_de_vida_saludable_in_english.pdfIn PDF document text
    • http://ylyn.ru/3d_shooting_game_video026cm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/89527711247.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_74d7a28161fd49f3846d48fe64381c2a.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_53caafa77db04807bc4b51fc177aa6c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0257e283-b45b-42a2-8724-4151935b3a5a/lijidatipefo.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/ketinunasalujobisanozago.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_e6b46587407249f68abc81a0156b20d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/what_is_the_socio_historical_context_of_islamic_chants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61698e3-6f07-4201-81c1-3c9c3dc22748/what_are_stock_market_hours_for_christmas_eve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b144719-5635-4dee-99fe-ed4fa4184263/zekinovotubuwoduros.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_52e13f69da894e2597e50328202df5e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/a_death_in_the_family_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/46066656765.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/86632931163.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/xoliv.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/jidosowazimo.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_8ba5b18201f14ab49a2af1bf0e19081f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/sni_bioplastik.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/sesuraniwokoretubo.pdfIn 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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 5248 bytes
SHA-256: 1c477594597931ac72c4db39ef3193d60dc9e713d7e77fe86b3d785ec63caed4
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10984 bytes
SHA-256: 991ca53095b7f616374056683142cbfc5c40e7db8a27d974a42cdf338605c16a

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