Malicious PDF — malware analysis report

Static analysis result for SHA-256 153685a9221925cd…

MALICIOUS

PDF

65.3 KB Created: 2020-03-20 13:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cfbff4c65de5a0315e94105a80059c44 SHA-1: 66d6a07b026698b66ea2d8d4e314993cf56d1fbc SHA-256: 153685a9221925cda1f2152de927f916fe9c3076b38ca1c56f43b048b481806c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of malicious intent.

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://therapistnewjersey.com/uploads/1/3/0/9/130968976/130968976.html#metal+ligand+charge+transfer+ppt
    • http://www.laurawilkes.com/uploads/1/3/0/7/130776542/2501706.pdf
    • http://www.bearbathrooms.co.uk/uploads/1/3/0/2/130287893/17010c4328a4a60.pdf
    • http://microsaninfocell.com/uploads/1/3/0/7/130738658/bizeli-vimubel-jidoj-dumog.pdf
    • http://pigdogindustrialconcreting.com.au/uploads/1/3/0/4/130477394/7060170.pdf
    • http://efcoform.com/uploads/1/3/0/7/130775509/palaneb_mebixuwone_vaxikavaz.pdf
    • http://ultimatecontradiction.com/uploads/1/3/0/4/130435570/jadudapiw_dekijigotop_zewetidonexavid_sikaje.pdf
    • http://firstlibertiessecurities.com/uploads/1/3/0/8/130814673/5f5ce.pdf
    • http://www.ginsengdaily.com/uploads/1/3/0/6/130639746/nijitafuzofe-poxeg-wemifigotabin.pdf
    • http://shoetossers.com/uploads/1/3/0/5/130588712/2b2af1c46653.pdf
    • http://www.nautilus-excursions.com/uploads/1/3/0/5/130550955/zorudula.pdf
    • http://l-wear.com/uploads/1/3/0/3/130313378/xoriga.pdf
    • http://tmptd.com/uploads/1/3/0/5/130546209/8179667.pdf
    • http://thalermontage.ch/uploads/1/3/0/5/130551015/5594990.pdf
    • http://feiradenegocios.com.br/uploads/1/3/0/7/130776728/1113414.pdf
    • http://natashadavid.com/uploads/1/3/0/5/130539926/lovobusivaza-defupe-sanajaxajuna.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4c5.bin
db172f3c5cd0af2b60973297b97d403f46e6ee5b51d5b77d75a87e76bad27c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4C5 3460 bytes
font_01_sfnt_off0000b197.bin
42e7e550c3092d3770f55627d2441d78a14307332ef1ed0157f913274db7da1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 9196 bytes
font_02_sfnt_off0000d4bc.bin
1b8964bd122309260601ecf407d195259693182ff7dab2558bb126b37097a0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 2868 bytes
font_03_sfnt_off0000deea.bin
45c02b2af6541e968a29cce5065daad11ceb89767f7e442eecf81181f98fbc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16520 bytes

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