Malicious PDF — malware analysis report

Static analysis result for SHA-256 640e6f038c02147e…

MALICIOUS

PDF

36.8 KB Created: 2020-04-04 14:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 292874cba4642ee5d2df0d5129034ff2 SHA-1: e55ddceed649f47009a239ce1e3d54766f29bd99 SHA-256: 640e6f038c02147ea1314c2a4041f8889e6df8ae4cc2d0ecf6d8884ffc666d26
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO spam campaign. The document body itself contains a title related to mathematics and embedded URLs, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful sites.

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://carpetcleaningbridgeview-il.com/uploads/1/3/0/2/130273576/130273576.html#suma+de+fracciones+mixtas+con+enteros+y+diferente+denominador
    • http://simpleybubbley.org/uploads/1/3/0/8/130813606/be8400018b83.pdf
    • http://affordablecustompools.com/uploads/1/3/0/8/130813965/lunelafedifaren.pdf
    • http://medvetcursos.com/uploads/1/3/0/2/130273589/fixotega_vifapo_wijoroj_xawopodejuz.pdf
    • http://globallylocal.biz/uploads/1/3/0/4/130476563/7135727.pdf
    • http://brookdaleventures.com/uploads/1/3/0/6/130604690/9143914.pdf
    • http://focmushingteam.com/uploads/1/3/0/7/130739517/somimu_nejavavixokim_wimegun.pdf
    • http://bthebuyer.com/uploads/1/3/0/7/130776142/1500013.pdf
    • http://markthjalfun.com/uploads/1/3/0/6/130620704/ccfb1.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_off000064e3.bin
8b5a2b37ca44baf28c4a88bdd6c7e097d32ee08d733a46a9e87677538fdc8071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E3 8548 bytes

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