Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df3b667340c586c…

MALICIOUS

PDF

47.0 KB Created: 2020-04-14 01:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 555e0c9b87e4d0f8fd325ef7be5e8e4e SHA-1: a20085d48e01b0f2a813c6e07fd09113333a0e1e SHA-256: 5df3b667340c586cc540b559509da8577a9d16a87e655284f8f6437071265bf2
96 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a link farm strategy to redirect users to potentially harmful content. The embedded URL, 'http://sixtyfirstsat60.com/uploads/1/3/0/7/130775654/130775654.html#remove+bloatware+without+root+on+android', suggests a pretext to engage the user. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sixtyfirstsat60.com/uploads/1/3/0/7/130775654/130775654.html#remove+bloatware+without+root+on+android
    • http://thewallcoveringboutique.com/uploads/1/3/0/8/130813799/363842ef02.pdf
    • http://maisaengager.com/uploads/1/3/1/3/131380128/dogag-lodusaborabanib-wasebubenugari.pdf
    • http://kelsiadamekpostelwait.com/uploads/1/3/1/0/131069992/geluxikivowalikel.pdf
    • http://eneduerabe.org/uploads/1/3/1/4/131438353/4b77e.pdf
    • http://timoyler.com/uploads/1/3/0/4/130491594/gugogebebonegowerese.pdf
    • http://edelsteine-diamant-schmuck-geschenke.de/uploads/1/3/0/5/130588584/bunukalefitomi.pdf
    • http://kdtsa.ch/uploads/1/3/0/6/130640072/916a52.pdf
    • http://urbangirlsgaragesale.com/uploads/1/3/0/5/130540240/ad618ce4d6f572.pdf
    • http://fredachaney.com/uploads/1/3/0/3/130323515/0647af2aab172d1.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079a5.bin
726c23f0c53d84fd851b9e9fecaa0cb89dc797b9eb6ce0f8adc581634b388d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 7960 bytes
font_01_sfnt_off000098b8.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B8 16096 bytes

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