Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef810454d3eb94d…

MALICIOUS

PDF

123.7 KB Created: 2021-04-01 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e67cc2c35108528fae60dff8c65f6300 SHA-1: c23eede16c542b7ea00e7b805a232f8f84d3c51f SHA-256: fef810454d3eb94df683ae4c0479626620daa6a48e8175fec1eaf53a6be2ed30
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 pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kuzutuzo.ru/award?keyword=alice+in+wonderland+original+text+pdf PDF link annotation
    • http://bukipumil.mypressonline.com/business_analyst_role.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/52097411351.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/vigoduxemadu.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/muvemasoxaji/pelimuwiju.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/50454508396.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/eular_lupus_guidelines.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_638975ffaf3d483c9b74caaaaafb3142.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/gulafot.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/nulevipiri.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/rigipadamajuxobawax.pdfIn PDF document text
    • http://notadagas.rf.gd/jogekowugunaremokilo.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/abox_a4_android_7._1_tv_box.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/31791660998.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/barbra_streisand_album_free.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/gestores_de_referencias_bibliogrficas.pdfIn PDF document text
    • http://midelex.epizy.com/69738411097.pdfIn PDF document text
    • http://tunazafagid.epizy.com/cloudformation_template_for_vpc_flow_logs.pdfIn PDF document text
    • http://mosupixozijet.epizy.com/bio_data_sample_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/catalogo_esselunga_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/bubabajorumuzivazuki.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_4f20f4a00d3c4988a25cbbc5d726822a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/63301630740.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/litetubalusufenozi.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_bef9aecf4f1e4a0492a0cc70c56e8a7d.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_183d28e3d84342af9c855ff2ed3350e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/fizitagoted.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000194c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C9 3756 bytes
SHA-256: 608aa58acd8e9dcabf592ec4241176f31dc6ff5ebc5a4f210d0533dec8beb0cb
font_01_sfnt_off0001a21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A21D 5296 bytes
SHA-256: 9bcb453968a2eecb6c65d0493a23a8cbe2076c43cc472410ee062dc61780a884
font_02_sfnt_off0001b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B449 14280 bytes
SHA-256: c53ab81889028e8c7afc3333117800a70e5e027043e8c11e14239e1d2656da84

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