Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab61e5378ee0064e…

MALICIOUS

PDF

47.5 KB Created: 2020-03-29 09:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f340b40212b844b3dec9aa551ad88e9d SHA-1: 9cbfc4cbe7ff02c9da4462fd52242adee2308953 SHA-256: ab61e5378ee0064e3fc887242c67b6aa228e2460646de622ef441cb793575f02
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, http://corustest.devsite-1.com/uploads/1/3/0/6/130604459/130604459.html#loreal+preference+hair+color+natural+blonde, appears to be a lure for users interested in hair color products. The overall structure suggests a link farm or redirection mechanism designed to lead users to potentially harmful content hosted on these external sites.

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://corustest.devsite-1.com/uploads/1/3/0/6/130604459/130604459.html#loreal+preference+hair+color+natural+blonde
    • http://www.cascinabellavista.com/uploads/1/3/0/7/130775866/6346330.pdf
    • http://mechart.net/uploads/1/3/1/0/131071290/98e62162868.pdf
    • http://sportmodels.org/uploads/1/3/0/4/130477234/29caa.pdf
    • http://trignetra.com/uploads/1/3/0/4/130483736/31abe.pdf
    • http://mensajeriaparada0.com/uploads/1/3/0/7/130775393/7345768.pdf
    • http://gaiafloralart.com/uploads/1/3/0/5/130588997/21edc398ef0ceb.pdf
    • http://absolutehedgefrankfurt.com/uploads/1/3/0/6/130620778/jineruxasijitemesob.pdf
    • http://foschia.com/uploads/1/3/0/6/130620948/76b12ddd68b.pdf
    • http://kirtanshack.com/uploads/1/3/1/1/131164537/gusosaxigidulub.pdf
    • http://thecsdoula.com/uploads/1/3/0/8/130874175/demuvizaleli_setutina.pdf
    • http://bluestoneag.net/uploads/1/3/0/5/130545954/5246763.pdf
    • http://allrawmusic.com/uploads/1/3/0/7/130776446/fipemevu.pdf
    • http://www.freebossgoddess.com/uploads/1/3/0/4/130483862/dorukovoxibafo.pdf
    • http://localnannys.com/uploads/1/3/0/2/130287989/1c731a08034.pdf
    • http://privatelabelspaproducts.com/uploads/1/3/0/6/130604320/gizabimijalazu.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_off000093e1.bin
d11fa3fa214720668f693430f5aa21b4ea8cf33e43a6a735819b9301ef096ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E1 7568 bytes

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