Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8b0c3dcb1ba1f3…

MALICIOUS

PDF

38.8 KB Created: 2020-03-29 14:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 943ffbdf99c2b0c7734f111daa685415 SHA-1: 1fce8d5aaf87ca01afe3919fc38cb3095ca46502 SHA-256: 0a8b0c3dcb1ba1f32c9d1342bfc7371452c4ca14320e03f935254866f00b7a1b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://adsl-63-204-18-43.benefitplans.org/uploads/1/3/1/1/131164125/131164125.html#grupo+3+de+las+niif+en+colombia
    • http://michelleblanchette.org/uploads/1/3/0/2/130291489/46e781093a44b55.pdf
    • http://drmaxhigh.org/uploads/1/3/0/5/130590261/ca564.pdf
    • http://freepocketlistings.com/uploads/1/3/0/7/130776246/bataxinujexuw-nunoxa-zurifezile.pdf
    • http://helix-intraocular.com/uploads/1/3/0/8/130873710/bozid-fofitifa.pdf
    • http://alexisdkirkwood.com/uploads/1/3/0/6/130621964/gopeg.pdf
    • http://597251050512178.com/uploads/1/3/1/3/131380899/5141170.pdf
    • http://plant-to-plate.com/uploads/1/3/0/6/130603958/jefamoz.pdf
    • http://valeriesgardenbabyandtoddler.com/uploads/1/3/0/6/130621223/9693443.pdf
    • http://cheerstocooking.com/uploads/1/3/0/4/130436450/vulumotizokak_gamudotebipuzix.pdf
    • http://outsideisin.net/uploads/1/3/0/9/130969920/gogimawod-jusajuwufa-foverixiwusa-pibafilemadunox.pdf
    • http://tunedly.me/uploads/1/3/0/8/130814303/6f3189af5a56.pdf
    • http://kappacommunity.org/uploads/1/3/0/8/130874422/3a61dede.pdf
    • http://apiarium.eu/uploads/1/3/0/4/130489122/gelobedigasi_piruj_mejideza_lirizoj.pdf
    • http://thealexanderbrand.com/uploads/1/3/0/5/130539090/zobaxo_nuvaremaxix.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_off00006e01.bin
0d21837261f003d226dad28034ed569f8bdcb5c11e69d605d94ea6073dcef442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 8372 bytes

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