Malicious PDF — malware analysis report

Static analysis result for SHA-256 5beff218ee7a84b8…

MALICIOUS

PDF

38.9 KB Created: 2020-06-14 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f054ea71e4a8c050fc85eda2f487a738 SHA-1: 58f0afdae535862ab63b702cb89dc8bc38910fc5 SHA-256: 5beff218ee7a84b82c212a862e28570cdafa3744cf2bd81e63d44af4782c3f4d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded URLs and the document body suggest a link farm or SEO spamming operation. While no explicit malicious script was found, the sheer volume of external links and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic or host further malicious content.

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://mastercraftglobal.com/uploads/1/3/0/6/130620574/130620574.html#factor+math+worksheets
    • http://edensmojo.com/uploads/1/3/0/6/130640033/zoligata.pdf
    • http://glynncountygranite.com/uploads/1/3/1/3/131379012/3530132.pdf
    • http://martechmarineconsultingllc.com/uploads/1/3/0/5/130545633/0f7ce85778ebbf.pdf
    • http://somacare.net/uploads/1/3/1/3/131381900/ganadujib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nudalodiwa735009136.files.wordpress.com/2020/06/6218702864.pdf
    • https://jalabojo512567158.files.wordpress.com/2020/06/vuzajemagugabegidi.pdf
    • https://muxetapotima.files.wordpress.com/2020/06/kapimudekilanisepuwotir.pdf
    • https://fifonupiza861279328.files.wordpress.com/2020/06/85731887722.pdf
    • https://pujobat.files.wordpress.com/2020/06/76147913454.pdf
    • https://mebanome.files.wordpress.com/2020/06/92316290666.pdf
    • https://pexiweki.files.wordpress.com/2020/06/bovoxo.pdf
    • https://gexefaduxoka.files.wordpress.com/2020/06/27643801263.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_off00006b6d.bin
5e20a89eabcaf7fe4f1938eeed5d5e3343a46621f13b106d3337e281d57c8cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 10408 bytes

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