Malicious PDF — malware analysis report

Static analysis result for SHA-256 68658784a89242dc…

MALICIOUS

PDF

34.8 KB Created: 2020-05-15 05:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c5c5d111ab044213d27fd111fc9fde SHA-1: a2571b55dc8d01ccacaee8fb5955798de6f18bab SHA-256: 68658784a89242dce369dc4f744faf3560ebaffc7558337ea968cd8bee4954c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are the primary indicators of compromise, suggesting a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://endlessarttattoo.com/uploads/1/3/1/3/131380868/131380868.html#hrsa+uds+progress+report
    • http://hillcountyplungettes.com/uploads/1/3/0/2/130289476/25c5ed23cef.pdf
    • http://toyota-trd-super-power-trd.com/uploads/1/3/0/5/130589276/pubinamanadovuwuw.pdf
    • http://gototravelus.net/uploads/1/3/0/7/130738841/vojakubanis-gotumabititojed-jozox-botiju.pdf
    • http://denniseasterfineart.com/uploads/1/3/0/2/130272613/8208026.pdf
    • http://gradient.services/uploads/1/3/1/3/131379384/gunaduni.pdf
    • http://lowerinsuranceprices.com/uploads/1/3/0/5/130551245/misilewo.pdf
    • http://livestockniagara.com/uploads/1/3/0/6/130621702/f50a8b6ce7e.pdf
    • http://feistykreations.com/uploads/1/3/1/4/131406284/jafoku.pdf
    • http://donjongamingtavern.com/uploads/1/3/1/6/131606938/kupopozetirumi.pdf
    • http://rylandgulbrandsen.com/uploads/1/3/1/6/131637240/499599.pdf
    • http://tresaguasaustin.com/uploads/1/3/1/3/131380420/a582d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c9d.bin
6c722118717dfa83e913b55a23251196d4fbac9a66ade1d36f59a544046abd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9D 10460 bytes

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