Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16205d0f5a4a03e…

MALICIOUS

PDF

74.0 KB Created: 2021-03-17 21:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 638c870a493f4487edd55f68c0135955 SHA-1: 115699ce167f580d1f65f3fad095e8fa92a47357 SHA-256: f16205d0f5a4a03edacb85c756f180087f5bceb6f7434c0c7bff3777492a2959
66 Risk Score

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 0.9997

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://crophysi.ru/wix?keyword=graphing+square+and+cube+root+functions+worksheet+answers PDF link annotation
    • http://salearea.pro/best_monthly_budget_excel_spreadsheetgy1t6.pdfIn PDF document text
    • http://sethel.xyz/nidon9gcns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_60479371ae985.pdfIn PDF document text
    • http://kasyanbeauty.com/tomapuvufadevoridinez9rrh4.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/d5jcJjy/football_manager_2020_best_tactics_arsenal.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/U5OQhiY/29916715618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_6015114a8d371.pdfIn PDF document text
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/5637211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_601e446ae080f.pdfIn PDF document text
    • https://cdn.sqhk.co/jibanukagexa/gIz30ig/19129388326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_6051edf380da8.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/heIhgii/nupekulinodo.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/zaxizuwuxutijusike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fcfee1913f88.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/52TMhed/kesesejemuwumunijalix.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/wovugi/breaking_benjamin_diary_of_jane_acoustic.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_ef726ee8f6c24f50b6712299774243d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/16077771842.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/what_are_the_4_contingency_leadership_theories.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_5ba6de26814e43c1930011030e576184.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 5836 bytes
SHA-256: afda2f7e41910261dfc677f4e6f4ea4f32ca4cd4bb5817c3ebfc292d716feefd
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 10388 bytes
SHA-256: 2961299853df2f4f418e215a3b1ac623942739f61fdeb681a844d088f5923381