Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2b1e661afa9b7e…

MALICIOUS

PDF

36.7 KB Created: 2020-04-11 10:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0710aab4466315dbc5672d7c9e421829 SHA-1: 049c6b738b59a962431559ad6b40488ef862857e SHA-256: 1c2b1e661afa9b7e7b33630f198430377d956551c989018c5d35cb71c0b82704
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. The embedded document body text, though garbled, contains references to a book title and the wkhtmltopdf application, suggesting a lure document.

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://multistreams.com/uploads/1/3/0/8/130874395/130874395.html#the+language+of+medicine+9th+edition+pdf
    • http://marissamcdonnell.com/uploads/1/3/1/3/131381963/zeginazuvon-lenux-wefodele-xotixuvuzozosor.pdf
    • http://scubatom.com/uploads/1/3/0/3/130323814/982056.pdf
    • http://jaydavismusic.ca/uploads/1/3/0/3/130313429/843463.pdf
    • http://iaanlp.org/uploads/1/3/0/6/130639136/gegelikoga.pdf
    • http://carpetcleaningwinston.com/uploads/1/3/1/4/131437867/3704905.pdf
    • http://midhudsoncpr.com/uploads/1/3/0/5/130590592/b801a94.pdf
    • http://thegayman.com/uploads/1/3/0/4/130476082/nurujaxijej_pajilibo.pdf
    • http://funksoul.org/uploads/1/3/0/8/130874064/juzowasogade.pdf
    • http://personaldogfinder.com/uploads/1/3/0/6/130639181/gozuronovuxib_zobin_gumorit_tukoxanuvojebub.pdf
    • http://ozziejohnson.com/uploads/1/3/0/6/130620228/runesarexame.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_off0000676e.bin
0ee1f4db194121ad197d03feb418c103f6440afd73d02eacc2cdb976f1516cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 8052 bytes

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