Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d80161e90fa52c…

MALICIOUS

PDF

83.9 KB Created: 2021-03-27 09:38:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1abb1ee8e05c7a4d136c43bea8aa918d SHA-1: 5a7966a642f7230bc915895c0c06e0a4e56d300f SHA-256: 88d80161e90fa52c4cd280376bc2318c93e3987fccd6ecf4527055494f06c02d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zajinet.ru/wix?keyword=quantum+eating+dry+fasting+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426953/normal_604e91cb2bffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_60486340904d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_6015eefdc71de.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/warapagefasovi/75346989194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5724dbf-ac0f-4dc9-9623-0a3609271f6b/contax_g1_28mm_review.pdfIn PDF document text
    • http://mutexuwe.epizy.com/formaes_arbustivas_e_herbceas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badbc2fe-1e82-427a-a23b-e038775523cb/dr_brown_sterilizer_how_to_use.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/nixon_ladies_watches_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b39b1d-5326-4904-9758-06ebf6be41d5/curso_de_ingles_online_gratis_reconhecido_pelo_mec.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/xelelokijaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/nenajurifuzaremigona.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/82504552544.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_4b12b53cf5724f5885665e05ecb2c8b9.pdf?index=trueIn PDF document text
    • http://zitarepawe.epizy.com/ap_stylebook_2020_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/puroxadadijiv.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_967a62158ac24f14b38d2e87ee09cc8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/000e6e7a-7c60-43e0-bccf-208778d7e58e/kung_fu_panda_2008_full_movie_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/how_to_fix_sax_cork.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/98610317684.pdfIn PDF document text
    • http://sidakofonol.epizy.com/sexitekepubatijas.pdfIn PDF document text
    • http://wetowudokik.epizy.com/column_design_spreadsheet_excel.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_cfe9f1f5fdef4affa6dc806e812429a1.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_786c0659359e4aa9a8543c11ecd0e5d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/tamil_midnight_songs_kuttyweb.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_344124b43d484a71a647e678d3c05af6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f469b7-f39b-4443-9391-c43341d97094/11462672642.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_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 5492 bytes
SHA-256: 8e31059e474367a41c0d35293423e1e5795a47812a4ef511423fcd4cd23f9769
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 11772 bytes
SHA-256: 807cd21e57728f07e43fa82f7700c7d8fdd6ebcf52db1ab07219da1fc86b53b6

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