Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c9d15d00efb03a…

MALICIOUS

PDF

70.4 KB Created: 2020-03-27 03:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1766466aa509f01e1d93624a9147902b SHA-1: c22079f3e28c777acb801967d113f08fec53dbcf SHA-256: e3c9d15d00efb03ab609a562f5af8e0393af872c21a2a0ee210b149a4482278c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute further malicious content via the linked PDFs.

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://allamericanhandyman.org/uploads/1/3/1/4/131407493/131407493.html#balanced+scorecard+measures+that+drive+performance+pdf
    • http://expertonboarding.com/uploads/1/3/0/6/130604162/7cbed.pdf
    • http://www.laranjaalgarve.com/uploads/1/3/0/7/130776374/2449263.pdf
    • http://industowerltd.com/uploads/1/3/0/2/130289385/detulotifuwizowi.pdf
    • http://evakatebiz.com/uploads/1/3/0/8/130874316/3159273.pdf
    • http://everlyconsulting.org/uploads/1/3/0/5/130543190/1813753.pdf
    • http://bodybycreation.net/uploads/1/3/0/2/130289232/toxuwiladibufa.pdf
    • http://thehandyhandyman.net/uploads/1/3/0/7/130775918/vupirukusivenuvi.pdf
    • http://southamericanrealestatefranchise.com/uploads/1/3/0/6/130639947/e0638e.pdf
    • http://publicrecordsfm.com/uploads/1/3/0/3/130379611/kefokoto.pdf
    • http://www.fastlaptrackbikes.com/uploads/1/3/0/7/130776316/vapinif.pdf
    • http://science4kids101.com/uploads/1/3/0/6/130604191/93e7986.pdf
    • http://shoreexcursionspuertoplata.com/uploads/1/3/0/6/130621896/jokeruriwedivi_mafif.pdf
    • http://nu-trek.com/uploads/1/3/0/2/130289724/junadotusosukemovafe.pdf
    • http://mfibuild.com/uploads/1/3/0/8/130874480/wupilonelaxe-zaximepitavune-dobumenipese.pdf
    • http://luxelogistics.co/uploads/1/3/0/5/130543305/6508634.pdf
    • http://brianthim.com/uploads/1/3/0/6/130621282/josagowa.pdf
    • http://bithandy.com/uploads/1/3/0/4/130475990/migeralesu_sodojulutofe_lifigaxifuf.pdf
    • http://qiopstripe.com/uploads/1/3/0/3/130313249/5866036.pdf
    • http://www.villasgreenvalley.com/uploads/1/3/0/3/130313130/7e1f85910c3e2.pdf
    • http://advanceddrugtesting.net/uploads/1/3/1/0/131070761/45ecb174c299.pdf
    • http://humboldtautodetailing.com/uploads/1/3/0/8/130874309/7054027.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_off0000e8b5.bin
ad5e9886430c4b1209d8b5a9192fbe1441b90cc374537071f0e03f491f1c6b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 8524 bytes

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