Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92552ba19209c3b…

MALICIOUS

PDF

79.7 KB Created: 2020-03-29 23:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0eae21bb611c9927e51697ab924cd341 SHA-1: 8f4fb4550f915026a832a54ac3b759b087d72a3c SHA-256: e92552ba19209c3b658d96a913f320147b5a42e7787e59e42654eb0eab1a5ead
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to numerous external sites, likely for SEO spam or to host further malicious content. No scripts were extracted, limiting the analysis of direct payload delivery.

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://5pointauto.com/uploads/1/3/1/4/131407668/131407668.html#hemostasia+y+coagulaci%C3%B3n+de+la+sangre
    • http://911flex.org/uploads/1/3/1/0/131070619/buzugevufo-zakujarufasoka-nitap-dipikawelovir.pdf
    • http://latimerj.com/uploads/1/3/0/6/130604602/nepotazelitafekak.pdf
    • http://galway-united-methodist-church.com/uploads/1/3/0/6/130639099/7a82ed0.pdf
    • http://builderwanganui.ltd/uploads/1/3/0/2/130291635/sesupowimugu.pdf
    • http://jordanslawncare.net/uploads/1/3/0/6/130604533/5643329.pdf
    • http://d12llc.com/uploads/1/3/0/4/130483552/gunezorunolazet.pdf
    • http://playdatesforkids.com/uploads/1/3/0/6/130639242/74937e04a32.pdf
    • http://iseaa.org/uploads/1/3/0/3/130323601/sarabomefuluw-xurosagobenogem.pdf
    • http://knutsonconsulting.com/uploads/1/3/1/3/131383373/8300680.pdf
    • http://monicamandell.com/uploads/1/3/0/7/130775172/16636ec67a2a.pdf
    • http://bluskyhomesllc.com/uploads/1/3/0/6/130639259/tuporuwefa-rejutasasoga.pdf
    • http://samautosalesllc.com/uploads/1/3/0/6/130620662/f22e73e.pdf
    • http://hollandmarsh-gold.com/uploads/1/3/0/6/130604314/0772c71b7fbb2.pdf
    • http://lepdesignandbuild.com/uploads/1/3/0/6/130621606/68739c4f9.pdf
    • http://peacesupportfund.org/uploads/1/3/0/4/130483213/4524329.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4f.bin
434c95bdabcf00d249a9ba21dd888f82eafee5bd7390b72ef8501ad39f7bea47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 8820 bytes
font_01_sfnt_off00011a28.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16036 bytes

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