Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74809a9b09b614f…

MALICIOUS

PDF

81.2 KB Created: 2021-03-09 10:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 09dc15916ad8e482fe7cdbcaeff7eef4 SHA-1: d0c852cfcfc98f5fde0b54ce9c010d5dc8bc9675 SHA-256: d74809a9b09b614fb53c3185158ec60f741143bbb87b107b71ea03bc4720d00a
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one leading to a website that appears to be part of a link farm or SEO scam. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious URLs, possibly as a prelude to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=adjective+personality+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445333/normal_600c9c44cec70.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/haXVjW6/42058621216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fd1574044072.pdfIn PDF document text
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/4437c42bbc.pdfIn PDF document text
    • https://pevopuxavinedun.weebly.com/uploads/1/3/1/4/131406680/povazesumatijiwozire.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/jhdgfZo/fazalixoge.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/hOiiljh/siberian_cat_adoption_florida.pdfIn PDF document text
    • https://juladugalevatib.weebly.com/uploads/1/3/4/3/134385664/migalip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425227/normal_6003cda91b879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6043bc7ba0055.pdfIn PDF document text
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/36279.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/sumesawoxajew/bharti_axa_redefining_general_insurance_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/sutinuzenu.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/pirate_of_the_caribbean_sheet_music.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_a7e15fbb4fb04cb193d88ea1fe367e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/is_it_safe_to_work_at_a_restaurant_during_covid.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_6c906a693d4d4814974e3166b0d2bea8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/salile.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/64073978654.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_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 5376 bytes
SHA-256: 887b90d43eaf852cb532b532c67605552b98387a2fc99700bf057aaba24c362d
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 10364 bytes
SHA-256: eaa82fa6b4b03cd50b657be6a5729b8c86c00eea2872479146a736aa76137821

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