Malicious PDF — malware analysis report

Static analysis result for SHA-256 4328af115c90c47f…

MALICIOUS

PDF

38.5 KB Created: 2020-03-29 08:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1aaee1eb612ce1bbfa5f4e5d8845f5e SHA-1: 79407b03e25a4cd752c8ed8559817cdf4e514bc1 SHA-256: 4328af115c90c47fa2e788c7e8da73d5e92ae7108ee39e55a0011606a2bbc801
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The document body contains text that appears to be a lure, referencing 'syllabus' and 'coevaluacion', likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://host49.carmichaelnl.com/uploads/1/3/0/6/130620863/130620863.html#uaeh+syllabus+alumno+coevaluacion
    • http://croslislaw.com/uploads/1/3/0/7/130739616/furabunarege.pdf
    • http://liveloveyoga.ca/uploads/1/3/0/7/130738720/81492e4a0400.pdf
    • http://millanlandscapeconcrete.com/uploads/1/3/0/4/130489080/lafok-pawusivogo.pdf
    • http://callahanbrooke.com/uploads/1/3/0/5/130589338/guketivufosoradovabe.pdf
    • http://magnifyworship.com/uploads/1/3/0/3/130379777/lesixazifeda.pdf
    • http://builder.adapianoacademy.com/uploads/1/3/0/4/130488615/madazudibabefuxuz.pdf
    • http://icehousepottery.com/uploads/1/3/0/5/130589264/5148464.pdf
    • http://silvertonnaz.com/uploads/1/3/0/6/130620464/7428319.pdf
    • http://jcedripstore.com/uploads/1/3/0/6/130639655/puweninepo-zobamawofu-zexonufadute.pdf
    • http://fancywatch.mx/uploads/1/3/0/5/130543050/tivujileduj_zoxilufofopin_tedidel.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_off00006b56.bin
c8b49a9a001a01d63783dce09ee3670067793877c8d67b8b0021b7a17a221390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 8860 bytes

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