Malicious PDF — malware analysis report

Static analysis result for SHA-256 2836ba4d4df98a5f…

MALICIOUS

PDF

82.6 KB Created: 2020-03-30 02:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aaccf679dbc22af5b191451f8cc0587a SHA-1: 65f5d477d4ad095da15b387b53888ab87e667877 SHA-256: 2836ba4d4df98a5fe0c7e652c9035dff2a176a30d2238e1369468d1c60e14438
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, suggesting these URLs are used to artificially boost search engine rankings or to host malicious content. The presence of the URL 'http://hotelvic-phase2-ko.devsite-1.com/uploads/1/3/0/5/130588286/130588286.html#estudio+de+casos+y+controles' in the document body further supports this, as it appears to be a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://hotelvic-phase2-ko.devsite-1.com/uploads/1/3/0/5/130588286/130588286.html#estudio+de+casos+y+controles
    • http://45innovations.com/uploads/1/3/1/3/131379591/4979753.pdf
    • http://lovelashesbypao.com/uploads/1/3/0/4/130488542/e814c.pdf
    • http://moragacounseling.com/uploads/1/3/0/8/130813997/letofadowelifer-kafanumam.pdf
    • http://mrgomez.net/uploads/1/3/0/7/130775634/8555462.pdf
    • http://insiteandonline.com/uploads/1/3/0/5/130589384/linotikap_loxije_banozawebebatum_gisibuki.pdf
    • http://dominik-bonk.com/uploads/1/3/0/4/130477372/5802774.pdf
    • http://prestigepropertyconsultants.org/uploads/1/3/0/2/130272619/kevawijag-mogubemezakex-wifogitisiw-tuzidipibo.pdf
    • http://littleleafflutestore.com/uploads/1/3/0/2/130270792/kukutosakisugukadure.pdf
    • http://westcountryheating.net/uploads/1/3/0/5/130543536/funatokovazibese.pdf
    • http://hollowbrookstables.com/uploads/1/3/0/7/130775905/xazitajaz.pdf
    • http://mybraincoach.org/uploads/1/3/0/2/130270796/mupolewigo_rigun_joxepage.pdf
    • http://bridgepointsearch.com/uploads/1/3/0/6/130621488/donakezufibus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ee.bin
ff87cda8c1d7ebdcb7f8f342951e362f5bb2863dab5b94f64dffe58bcf9f26e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 9664 bytes
font_01_sfnt_off000126ca.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 16036 bytes

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