Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd879e731080568…

MALICIOUS

PDF

39.1 KB Created: 2020-03-29 14:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9f0a08c302e973f245335887a168c8c SHA-1: 16f088bd5ea1bc4135cec83cf3ab6ce32f3dd83e SHA-256: 5cd879e731080568fa5cbda3889f3b1dda97a259cc8a4ec23513f8a91aa73e0c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a method to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were directly extracted, the structure suggests a potential for JavaScript execution within the PDF to facilitate these redirects.

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://ndchair.com/uploads/1/3/0/6/130604729/130604729.html#the+lovely+bones+movie+pdf
    • http://superhumanacadamy.com/uploads/1/3/0/5/130590531/cc7cce.pdf
    • http://calgaryweddingminister.com/uploads/1/3/1/0/131069870/rafodosapexegiponemo.pdf
    • http://jceuzebiocorp.com/uploads/1/3/0/5/130588987/5092945.pdf
    • http://luv-a-bull.com/uploads/1/3/0/9/130969511/4428674.pdf
    • http://titanicmoviecollection.com/uploads/1/3/0/6/130639155/021d19.pdf
    • http://rhemaorganics.com/uploads/1/3/1/1/131163992/towab_dufelu.pdf
    • http://sweetvero.net/uploads/1/3/0/4/130483852/xuzexiwina_gafufukikufofix.pdf
    • http://healingtouchreiki7.com/uploads/1/3/1/4/131409574/xemerujaxogun-kamegujififu.pdf
    • http://satzkom.com/uploads/1/3/1/0/131070178/zafobomejimuvuk.pdf
    • http://kingdomartisans.org/uploads/1/3/0/4/130483492/gexaxuxum.pdf
    • http://24h-loodgieter.be/uploads/1/3/0/6/130639170/5460805.pdf
    • http://bossladyempire.net/uploads/1/3/0/3/130313741/d282473c5.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_off00006d1e.bin
83a29faad93840b51267e9e3338e3b24d6feeda54f696e34982c7704119f2ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 9064 bytes

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