Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd66ef35505614e8…

MALICIOUS

PDF

42.0 KB Created: 2020-03-27 12:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eac958d7811817370497f12888379e05 SHA-1: cbc97e63abf891a4f70407d57ded9fa8374738c6 SHA-256: cd66ef35505614e85427fe555e204ddbf8016fa99bf2621f6bda3f3df32600fe
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains a URL that is part of this link farm. The primary attack pattern appears to be SEO spam or a link farm designed to direct users to a large number of other PDF files 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://klokkeraadgivning.com/uploads/1/3/1/3/131398113/131398113.html#manualidades+con+carton+corrugado+para+ni%C3%B1os+de+preescolar
    • http://blackgirlswandering.com/uploads/1/3/0/5/130546391/a3e72daab64f2.pdf
    • http://comoxmobilemassage.ca/uploads/1/3/0/8/130874612/xobeguwi.pdf
    • http://greenelementsmarket.com/uploads/1/3/0/5/130590036/tuwoturavebel_jizalewagefu_venaluseju.pdf
    • http://cadamsconsultinginc.com/uploads/1/3/0/8/130874493/fulixubitexonu.pdf
    • http://bestbrand2020.site/uploads/1/3/0/5/130550663/vojumikimivaj.pdf
    • http://wmbusiness2.yournew.design/uploads/1/3/0/6/130621942/vutomukeriweta.pdf
    • http://matthewpeckhamtenor.com/uploads/1/3/0/2/130288431/5177128.pdf
    • http://www.delicious-goodies.com/uploads/1/3/0/6/130603763/serukarutif.pdf
    • http://4055nelsonavenue.com/uploads/1/3/0/4/130483809/turinojeb-rimorafikosim-newufusuxifovu.pdf
    • http://summersaleswork.info/uploads/1/3/1/0/131070196/vugimoxi_genizegu_sinejova_fefopesifaxe.pdf
    • http://gtbcf.org/uploads/1/3/0/7/130739504/timup-govizovenuriwod.pdf
    • http://sky-high-productions.com/uploads/1/3/0/4/130436258/678f2a82e170e3.pdf
    • http://www.vmv66.com/uploads/1/3/0/8/130814145/9554448.pdf
    • http://authorkimberlyhodge.com/uploads/1/3/0/6/130604090/d3a36bf9ef1.pdf
    • http://cuttingedgepainters.net/uploads/1/3/0/5/130589217/996621.pdf
    • http://vegefullvybez.com/uploads/1/3/0/7/130775803/4420321.pdf
    • http://gustavandjennifer.com/uploads/1/3/0/5/130588551/dexulori_xenebe.pdf
    • http://jjsphotographyatx.com/uploads/1/3/0/8/130813762/5508132.pdf
    • http://integrated-health.net/uploads/1/3/0/4/130488091/b6fd63e6a.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_off00007916.bin
7b59bb8e15926f8619e44966264a453295a2359508d74a26c0b94641f98671f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7916 8308 bytes

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