Malicious PDF — malware analysis report

Static analysis result for SHA-256 1781acc9a5c2f4d1…

MALICIOUS

PDF

53.7 KB Created: 2020-06-03 15:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4a591f55acd23c4f2d545fc29fdb4fe SHA-1: 6a67b1705295979f49cfd3e905fdd518af680be0 SHA-256: 1781acc9a5c2f4d1fd23e5c6e6345d9e1f64f26ba3d9e50eeba6f9019b5b80fb
96 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that point to external websites, masquerading as a quiz. The PDF_SEO_LINK_FARM heuristic indicates a large number of such links, suggesting a link farm or redirection mechanism. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure for further malicious activity.

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://flex87.pleasingfood.com/uploads/1/3/0/7/130776519/130776519.html#questoes+sobre+revolu%25C3%25A7%25C3%25A3o+francesa+com+gabarito
    • http://monumentsolutions.ch/uploads/1/3/0/6/130621366/rugesapawi.pdf
    • http://itscaketime.org/uploads/1/3/1/6/131637780/428b2daa9a65.pdf
    • http://penryarcher.com/uploads/1/3/0/8/130814508/4046334.pdf
    • http://crossfit191441.com/uploads/1/3/0/5/130589070/5974507.pdf
    • http://flex87.pleasingfood.com/uploads/1/3/0/7/130776519/terms.html
    • http://flex87.pleasingfood.com/uploads/1/3/0/7/130776519/dmca.html
    • http://flex87.pleasingfood.com/uploads/1/3/0/7/130776519/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sukaligi.files.wordpress.com/2020/06/zamikufesamavipumubizesaw.pdf
    • https://fojubinoxob.files.wordpress.com/2020/05/69291513892.pdf
    • https://muzinag.files.wordpress.com/2020/05/pidemuzekozemuzuwe.pdf
    • https://wimilidovibi.files.wordpress.com/2020/06/25736064666.pdf
    • https://mitikufit.files.wordpress.com/2020/06/sitalekokizobareponisajat.pdf
    • https://mafowuz351854288.files.wordpress.com/2020/06/47186694142.pdf
    • 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_off0000a135.bin
d5e5105720269e5e1edca1033fd893f8a851baa8f750c53a24c8a61e992bff65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA135 13372 bytes

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