Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57cc2555b523ae3…

MALICIOUS

PDF

38.4 KB Created: 2020-04-05 14:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d87917ea6b77f08858f45179a5f585a SHA-1: af12172ee03bcba1d98d576df5d3eb0cdfa12ae5 SHA-256: a57cc2555b523ae3c6134fcdc4d274c1dadf10deebc617a70a8a8aae561348ea
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though partially corrupted, contains text related to 'Lazarillo de tormes prologo resumen' and references wkhtmltopdf, suggesting it was generated programmatically to host these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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://avabaycompany.com/uploads/1/3/0/6/130603793/130603793.html#lazarillo+de+tormes+prologo+resumen
    • http://listenupmedia.net/uploads/1/3/1/4/131406337/vogozuke-rewevuri-pidisozim-jewojemadex.pdf
    • http://mylouisvillehomeneedswork.com/uploads/1/3/0/5/130541944/5767085.pdf
    • http://wwgoogetransport.com/uploads/1/3/0/5/130588654/f1b5586afd95e.pdf
    • http://usdinstitute.net/uploads/1/3/0/3/130323836/5202433.pdf
    • http://vegapersonaltrainer.com/uploads/1/3/0/7/130776249/8720660.pdf
    • http://mx.sportsapparel4u.com/uploads/1/3/1/4/131454237/ee0fb.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bee.bin
dd58129e85fc2f781b8b1499e4b9c0f32778331f0735f08165960ead24f68052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 8672 bytes

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