Malicious PDF — malware analysis report

Static analysis result for SHA-256 757319e9248c224e…

MALICIOUS

PDF

33.2 KB Created: 2020-05-29 17:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40d53b481d15a55e18599e05c872465f SHA-1: 0cacd25d7137175cbd1278bc1d89265f8aa34f41 SHA-256: 757319e9248c224e9c858c14d431a5c362106f627050958ff3242a3f47f02c7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a coordinated effort to direct users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://interior-ahec.com/uploads/1/3/0/8/130815726/130815726.html#goutte+%25C3%25A0+goutte+fait+maison
    • http://mail.aircad.nl/uploads/1/3/0/2/130270831/balafijorubapa.pdf
    • http://discipleshiptraining.org/uploads/1/3/1/4/131482992/pubumisajadedat.pdf
    • http://jacobmastudio.com/uploads/1/3/0/9/130969231/1911683.pdf
    • http://timmahekdds.com/uploads/1/3/1/3/131379421/rosewupedudom.pdf
    • http://yunustech.club/uploads/1/3/0/5/130550763/5674519.pdf
    • http://thelincolnimpscunthorpe.com/uploads/1/3/0/8/130874379/0459b23a4d85e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005231.bin
642ab987089f6bfc7bd3cafe0bc74674a71321d2f32e7aca021ea9f0d7f82fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5231 11968 bytes

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