Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ed0bd40958a88e…

MALICIOUS

PDF

44.2 KB Created: 2020-03-29 04:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d73567cd19a0773e7e033bd497553048 SHA-1: cf6a029ebdd23a4141b11253ff2d6427ba18962c SHA-256: b4ed0bd40958a88eff272fa4fbefec9a3c13d2116b7fee6ae49dc5a5a431c2b1
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body text, though partially corrupted, contains a title related to metaphors and references the wkhtmltopdf tool, suggesting it might be a lure document. The primary attack pattern involves directing users to a link farm hosted on various domains.

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://greenwolfverticalfarm.com/uploads/1/3/0/5/130539340/130539340.html#que+es+metafora+un+ejemplos
    • http://openpublicforum.net/uploads/1/3/0/7/130739070/buridelapabekan.pdf
    • http://brookity.org/uploads/1/3/0/5/130550956/depisagate.pdf
    • http://tinytotdressshop.com/uploads/1/3/0/2/130272552/6303297.pdf
    • http://go.hopeforesthills.com/uploads/1/3/0/6/130604508/mibumusatojajir-bipop-ruwovuv.pdf
    • http://barryderbyshire.com/uploads/1/3/1/3/131382721/5d6ad47b5bf0f6.pdf
    • http://nebraskappg.com/uploads/1/3/0/6/130621371/9c908634ef.pdf
    • http://www.theconnectgoddess.com/uploads/1/3/0/6/130639283/lolamigorewa_tofod.pdf
    • http://11pluscolchester.com/uploads/1/3/0/5/130588430/1ae79fa5ee47627.pdf
    • http://therachelsue.com/uploads/1/3/0/4/130476053/e718de52.pdf
    • http://fairclothboutique.com/uploads/1/3/0/6/130639275/jivonubuz.pdf
    • http://mountainviewmentalhealth.com/uploads/1/3/0/8/130814680/8675545.pdf
    • http://millerfamilyadventures.net/uploads/1/3/0/5/130588740/gupalunabewokowaji.pdf
    • http://carzonerepairandbody.com/uploads/1/3/0/6/130604850/kewaxepigodav.pdf
    • http://bnrobotics.com/uploads/1/3/0/6/130639442/pejoginagopun.pdf
    • http://mail.trindlespringlutheran.org/uploads/1/3/0/4/130483487/gomikabasibubaparul.pdf
    • http://europeanfenestrationsystems.com/uploads/1/3/0/3/130379169/533065.pdf
    • http://filesmark.com/uploads/1/3/0/5/130588574/kapedawepol.pdf
    • http://varomsorg.com/uploads/1/3/0/3/130379407/6e9ceda98e.pdf
    • http://delcacao.ch/uploads/1/3/0/2/130287553/3808611.pdf
    • http://ucsdstrive.com/uploads/1/3/0/3/130313358/votixegavexogi_gezunubonidux.pdf
    • http://www.hoodarc.com/uploads/1/3/0/7/130776688/1301452.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_off00008019.bin
50139626ab3a969ecb9bcb07a0b5a630ab688d09b42d3ef2f4d9eb3cae85e2da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 9268 bytes

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