Malicious PDF — malware analysis report

Static analysis result for SHA-256 225b759e03417e71…

MALICIOUS

PDF

39.9 KB Created: 2020-04-03 17:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d41c186d69bf82039db427af06db399a SHA-1: 7bdba7d2badeffdfbd53ff9571e144d92d54b9f7 SHA-256: 225b759e03417e71c55e98bd9a546269fcc35baab652f66fb14cd71880860cbd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on various domains, suggesting a link farm or SEO poisoning tactic. One prominent link, "http://mercerwoodproductionsllc.com/uploads/1/3/0/9/130968973/130968973.html#background+check+apk+cracked", indicates a lure for cracked software, a common social engineering technique. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://mercerwoodproductionsllc.com/uploads/1/3/0/9/130968973/130968973.html#background+check+apk+cracked
    • http://joshunderhillsfurniture.com/uploads/1/3/0/7/130775970/zumodoruvovini.pdf
    • http://exchange.gllm.org/uploads/1/3/0/6/130604725/8855419.pdf
    • http://rightpointclinic.com/uploads/1/3/0/7/130775280/e89bcf.pdf
    • http://stellashollywood.com/uploads/1/3/0/5/130588622/e0c7f497ed145c0.pdf
    • http://rayyanmerchant.com/uploads/1/3/0/4/130488105/saveponimoz-degezuv-piveminobol-xitogizu.pdf
    • http://fitzenterprisesllc.com/uploads/1/3/0/6/130605089/zezodalepepidax-zadazudif-xoboponefuramo.pdf
    • http://melindaconnor.us/uploads/1/3/1/3/131398010/bojunepofiwade-digej-vixazesavib-logiz.pdf
    • http://unit1consulting.com/uploads/1/3/0/6/130620587/83ea753b01c0.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_off000072c7.bin
1ba9de3adf6d5cf23dee795f3e9c3e31a66b2c7a614aa8a30ada596121d3b8f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C7 8376 bytes

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