Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b3e359ea41bb93…

MALICIOUS

PDF

40.0 KB Created: 2020-04-04 12:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0bd43325caf622702a539d125bbd7885 SHA-1: 1f4bba2207070fa69739c1c1c27de6c2907d41d7 SHA-256: 94b3e359ea41bb93896ef9f703dc9c0b2ce9d92a809764e03e46b31d215a0821
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, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains references to these external URLs, including one that points to 'http://longcoatgsds.com/uploads/1/3/1/3/131380892/131380892.html#julius+caesar+act+3+scene+2+summary+short'. This pattern suggests the document is designed to manipulate search engine results or to lead users to potentially malicious content hosted on the numerous linked domains.

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://longcoatgsds.com/uploads/1/3/1/3/131380892/131380892.html#julius+caesar+act+3+scene+2+summary+short
    • http://logies-maretak.com/uploads/1/3/0/7/130738974/nujuxisigifes.pdf
    • http://bigbarranchblog.com/uploads/1/3/0/7/130776661/7a04f26c3a.pdf
    • http://talluriphotography.com/uploads/1/3/0/6/130621829/telivoruma_vujikud_regolewuweredug_buwanidizi.pdf
    • http://fiberandclay.com/uploads/1/3/0/5/130541064/9769266.pdf
    • http://expressmobiletinting.com/uploads/1/3/0/4/130489926/nijipe-kazugimopodo.pdf
    • http://tomnazario.com/uploads/1/3/0/6/130621328/3195994.pdf
    • http://txanogorritxu.com/uploads/1/3/0/6/130621061/nimafabefogulok_gopuzejuzupagu_vomigob_jukupixiresuxi.pdf
    • http://levelremodeling.com/uploads/1/3/0/3/130313309/7862783.pdf
    • http://christopherjordanclothingco.com/uploads/1/3/0/5/130546183/4f8a1860be.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_off00007643.bin
1d7af1a7180c383fab6257ee2fbfbf861cd3d51c76e73412ef522cbf5e2565ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7643 7396 bytes

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