Malicious PDF — malware analysis report

Static analysis result for SHA-256 7349ed5ec8920506…

MALICIOUS

PDF

44.1 KB Created: 2020-03-27 14:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3d5264cc64ce9f62b8b7d6e6330050d1 SHA-1: 271be67f4dc5939e3bbd7b73fba0de7ff058e42d SHA-256: 7349ed5ec8920506e25a3f180fa60cacf7086747e3ca58d4dfec0f3bd07f28c6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links pointing to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://evokefitness.net/uploads/1/3/0/3/130312934/130312934.html#cuantos+tipos+de+mutaciones+existen+y+cuales+son
    • http://mta-sts.mail.kingstontreasurecoveantiques.com/uploads/1/3/0/5/130550912/3845394.pdf
    • http://www.jabissomaempreendimentoslda.solutions/uploads/1/3/0/4/130488935/217145.pdf
    • http://staceyclarkdllportfolio.com/uploads/1/3/0/6/130604429/2329306.pdf
    • http://linkedsources.com/uploads/1/3/0/5/130547924/dewasamexugedo.pdf
    • http://holdmybeer.club/uploads/1/3/0/6/130603945/6731558.pdf
    • http://davidedepretto.com/uploads/1/3/0/2/130289563/jewajuzisetowa.pdf
    • http://shellshockmusicals.com/uploads/1/3/0/6/130639975/tevunikosuxalik.pdf
    • http://acuphysician.net/uploads/1/3/0/4/130435884/5357949.pdf
    • http://frisco-auto-detailing.com/uploads/1/3/0/5/130545493/62ba7d5c55.pdf
    • http://sequoiahomesolutions.com/uploads/1/3/0/6/130604500/wenekezobu.pdf
    • http://zapddocs.com/uploads/1/3/1/1/131164034/sutefaruwakepazu.pdf
    • http://s-p-q.org/uploads/1/3/0/7/130739652/funojagibabefaladif.pdf
    • http://bridal-heaven.co.uk/uploads/1/3/0/3/130323620/1d9ea4a8b886.pdf
    • http://mygametruckcostamesa.com/uploads/1/3/0/3/130313242/1e64a.pdf
    • http://modestomasonry.com/uploads/1/3/0/6/130640191/gatiwipufuwapezilar.pdf
    • http://namecoinforum.net/uploads/1/3/0/8/130814931/fd13bbbc.pdf
    • http://www.got-itonline.com/uploads/1/3/0/5/130588703/konozexop.pdf
    • http://soulfullbroth.com/uploads/1/3/0/7/130775363/7321400.pdf
    • http://costamarketing.net/uploads/1/3/0/6/130639019/afa1b.pdf
    • http://themozartschool.com/uploads/1/3/0/7/130739850/7723347.pdf
    • http://heartbeetsmarketgoods.com/uploads/1/3/0/6/130604085/2138959.pdf
    • http://thechristianauthorsmarket.com/uploads/1/3/0/6/130639687/1915c6caca.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_off00008158.bin
9fee6d573f307daa371c5b26cbd976d9bfdcba1b3546d109d55698abdf777f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8158 8612 bytes

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