Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b71a99226e86cb…

MALICIOUS

PDF

33.8 KB Created: 2020-05-20 11:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7180ec081f32984b4281a508073d4e SHA-1: b7103628cdd1c9af13a4e9ab1ef7ed3a7c154ddc SHA-256: 12b71a99226e86cb456cea6509eb6f446cc250f1eab476bff05a3fef7b5b15b8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://michaelshusko.com/uploads/1/3/0/2/130287547/130287547.html#mack+e7+460+service+manual
    • http://harrisdalehandymanservice.com/uploads/1/3/0/2/130291561/zobudirenis_woxarizuso_bedaro.pdf
    • http://iamevernever.com/uploads/1/3/1/1/131164558/7059441.pdf
    • http://gregmotorshop.com/uploads/1/3/0/7/130739061/junedewabexogejupi.pdf
    • http://artculturevs.org/uploads/1/3/0/7/130776648/6765813.pdf
    • http://papershreddersgreatfalls.com/uploads/1/3/0/7/130776811/nububijizar.pdf
    • http://bellaballerinamelbourne.com/uploads/1/3/1/8/131871627/gibajufitow-tajoxowesejom-redibova.pdf
    • http://rockthebellfashion.com/uploads/1/3/0/5/130588239/9751760.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_off0000597c.bin
845fb90413673249d6955d0337da4406f4b0d31feadb19e211aa0a9bec5d10b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597C 10388 bytes

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