Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c1b31337af1a7…

MALICIOUS

PDF

48.6 KB Created: 2020-04-21 13:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0bbe9e3f2809eb609df5f723ae57e67e SHA-1: 85bce0ae5cd43828b8b0816020701c4a2e12187c SHA-256: ab1c1b31337af1a7b9a0d7e8ae478ac74fbf6a9fcf84473611a2a009673b5bbd
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary purpose appears to be directing users to a network of websites, likely for SEO manipulation or to serve malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://schmudenursing.com/uploads/1/3/0/4/130435694/130435694.html#is+cadence+of+hyrule++only
    • http://hydeparkviolinlessons.com/uploads/1/3/0/7/130776008/4089082d.pdf
    • http://cozychristmasbook.com/uploads/1/3/0/4/130483266/rigijejawavov.pdf
    • http://galactica143.com/uploads/1/3/0/4/130435633/sovogoxil-joxute.pdf
    • http://schwartzgroup-mi.com/uploads/1/3/0/6/130621947/7104bdece8.pdf
    • http://sisterhoodbirth.com/uploads/1/3/0/7/130740391/miverupomojax_guruvagoto_molufotajesamo.pdf
    • http://etypemusic.com/uploads/1/3/1/4/131408439/5604416.pdf
    • http://poolmaxstore.com/uploads/1/3/0/4/130475990/povulonogirux.pdf
    • http://moumoukaivalleyfarm.com/uploads/1/3/0/7/130738482/xuweluwet.pdf
    • http://kathywilliamstolstrup-lpc.com/uploads/1/3/0/6/130603688/790263afb5.pdf
    • http://investimentiglobali.com/uploads/1/3/1/4/131453623/sujopirojorokux-mexirisefi.pdf
    • http://bmwalkerenterprises.com/uploads/1/3/0/6/130603906/xifewelikev-fuzovixuvevu.pdf
    • http://galactica1
    • 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_off00007a21.bin
7be9fe59b4df9b76c5fc9d313a658021812edb993bedbf1cd404dcf645566cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A21 8492 bytes
font_01_sfnt_off00009a9a.bin
7524f85db3c3d084d2e6ce6b83cc4dec77ecde214ae60d0fd52cb36b95d7496d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9A 8592 bytes

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