Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c9353b516d22bb…

MALICIOUS

PDF

37.1 KB Created: 2020-05-15 23:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f376729d7013a15bc0e1e3cfe166c051 SHA-1: 3a39cd0adf961c0d5fb54e97eb17766076ab29c6 SHA-256: d7c9353b516d22bbfa63628781106320952a35f2a96baec5ba5be50ddaf2f01d
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The primary heuristic, PDF_SEO_LINK_FARM, indicates that the PDF contains mass external links, with a dominant host of 'season7boutique.com'. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to 'teaching fluency in guided reading' and metadata from wkhtmltopdf, suggesting it may be a lure to disguise the malicious intent of redirecting users to numerous potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://skunkhouse.net/uploads/1/3/0/5/130551994/130551994.html#teaching+fluency+in+guided+reading
    • http://season7boutique.com/uploads/1/3/0/2/130287279/xemev.pdf
    • http://maintco.org/uploads/1/3/0/7/130775834/makutarewovap_xoluz_warofax_zaxepobix.pdf
    • http://artbykaye.com/uploads/1/3/1/4/131438294/7819c0261b.pdf
    • http://musicforthemind.shop/uploads/1/3/0/6/130604836/7199980.pdf
    • http://vandermynsbrugge.com/uploads/1/3/0/4/130476263/facc139.pdf
    • http://amyswickedslush.net/uploads/1/3/0/7/130739488/tozuka.pdf
    • http://sarahminarik.info/uploads/1/3/1/3/131379420/xupemanane.pdf
    • http://icanstudyabc.com/uploads/1/3/1/6/131606598/panetofetigorus-susot-wuzajijun.pdf
    • http://cwscreeativeministry.com/uploads/1/3/0/7/130740017/2258838.pdf
    • http://oswegoboystrack.com/uploads/1/3/0/5/130550895/nakobituxe_weripiwawas_maperanu.pdf
    • http://wheresmario.com/uploads/1/3/0/8/130813652/fenefepeba.pdf
    • http://plussizeweddingdressesinnh.com/uploads/1/3/1/8/131860787/kemazevixajajog_mibub_tumujivem_fodagu.pdf
    • http://georginariel2018.com/uploads/1/3/1/6/131607683/monemo.pdf
    • http://takethefrontseat.com/uploads/1/3/1/1/131164440/cf36666e1.pdf
    • http://namesherpas.com/uploads/1/3/0/5/130589174/jutizidipeno-tokirurarig-tepoxikum-mebugipene.pdf
    • http://santa2you.net/uploads/1/3/1/4/131408024/fofijekawebi.pdf
    • http://thebarn-mo.org/uploads/1/3/0/4/130476122/9025a07b.pdf
    • http://sandiegobeermuseum.org/uploads/1/3/0/6/130621708/051d05a2511.pdf
    • http://chris-electric.com/uploads/1/3/0/4/130483830/sunumel-datubitove-fekamasozuzu-mimemevumari.pdf
    • http://scprobatelawfirm.com/uploads/1/3/0/6/130620998/6530241.pdf
    • http://pof-callapp.com/uploads/1/3/1/1/131164456/2dbc2eccf1b450.pdf
    • http://naturmedizin-quickfinder.de/uploads/1/3/0/2/130272886/9281814.pdf
    • http://bakermansbeatshop.com/uploads/1/3/0/8/130813972/zekafu_vidodamatax_lorep.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_off000066c8.bin
c2a971325280636d2e4b32901d545d42d9e9edc66f4a0490121b75cd53abdd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C8 9788 bytes

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