Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ea8093347cddca…

MALICIOUS

PDF

47.7 KB Created: 2020-03-11 01:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7f36783fd6a067b649c099a7e756a7ef SHA-1: b4601f69e4b23380ef27c4f50df43f0a34d07b1d SHA-256: 68ea8093347cddcad416367db3075db2938c63ae975f1dd3fd2f8bf7e8bf9fd0
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting the primary purpose is to redirect users to a network of linked PDF files hosted on various domains. No scripts were extracted from this sample.

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://201.bpmtc.com/uploads/1/3/0/6/130621307/130621307.html#acute+on+chronic+renal+failure+meaning
    • http://mauricejamescooper.com/uploads/1/3/0/6/130621467/dexexilize_letawelawet_lifagivi.pdf
    • http://beekeepinginalaska.com/uploads/1/3/0/4/130491008/9931124.pdf
    • http://bangbabyent.com/uploads/1/3/0/6/130605452/vajuzurubimetu_volirew_siporeti.pdf
    • http://bbpsports.net/uploads/1/3/0/5/130539479/5692096.pdf
    • http://www.vowsweddingdresses.com/uploads/1/3/0/6/130604681/xivofunomosatu_jidof.pdf
    • http://solarpilipinas.com/uploads/1/3/0/2/130272442/fe8ba7cf41daa7.pdf
    • http://mafamillecenla.net/uploads/1/3/0/7/130775806/82587a330fb2d1.pdf
    • http://marijuanamarketexchange.com/uploads/1/3/0/3/130323222/katabolabezexin.pdf
    • http://remade.info/uploads/1/3/0/5/130588885/wivosapivawi-milexi-wevarefajimikim.pdf
    • http://erinsemple.com/uploads/1/3/0/2/130270899/liwawuluze-kinilaxuviju-jogepiwireg.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_off00009017.bin
d77283bf97c13cce8dbcccf3cc4b00cd514d7d02e0adbbcda553a23a605faa66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9017 9396 bytes

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