Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87be5c19a30d384…

MALICIOUS

PDF

41.2 KB Created: 2020-03-23 04:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f90ca321bcfbbbb4556a98d5f3051170 SHA-1: 6cff1ee0da42fa5c5c9205c37ae88dbea8757541 SHA-256: f87be5c19a30d384efc1e6a4f44ddd669fb983a7ab075c0dd4f74974aad2e5eb
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or SEO spamming technique, often used to distribute malicious content or to manipulate search engine rankings. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://sportschica.com/uploads/1/3/0/5/130551697/130551697.html#comandos+para+ver+configuracion+switch+cisco
    • http://sherylpreston.com/uploads/1/3/0/2/130289799/b7f01b01ce52e.pdf
    • http://rosevillebailbonds.net/uploads/1/3/0/4/130478566/3410319.pdf
    • http://ryersonmetowe.com/uploads/1/3/0/4/130490977/xuvipemuxo-lexejoluxut-tebojev.pdf
    • http://www.mimeya.be/uploads/1/3/0/5/130546096/86256e492f.pdf
    • http://thesacredwyld.com/uploads/1/3/0/7/130775842/1532882.pdf
    • http://masonicdiscourse.com/uploads/1/3/0/2/130289476/baxixokutov-vumidotak-zijisidaj.pdf
    • http://parceble.com/uploads/1/3/0/7/130775753/5084520.pdf
    • http://btc.panaprint.com/uploads/1/3/0/9/130969368/5b6bb18.pdf
    • http://www.mamas-moment.com/uploads/1/3/0/7/130776485/nurepepijogavanib.pdf
    • http://realestateamychang.com/uploads/1/3/0/6/130620823/7567536.pdf
    • http://queenalexandra78ave.com/uploads/1/3/0/5/130550976/2257682.pdf
    • http://www.georgewrusselljr.com/uploads/1/3/0/6/130621510/f06bec2d6774.pdf
    • http://incrediblemeatdeals.com/uploads/1/3/0/3/130324370/muvajot.pdf
    • http://ofunatic.shop/uploads/1/3/0/6/130639733/depekugeno_fikugopagitaku_dawatuwusumazit.pdf
    • http://www.senditsimply.com/uploads/1/3/0/9/130969823/tomoresezusalised.pdf
    • http://www.shantarassoapandcandlecompany.com/uploads/1/3/0/3/130323733/xizalubaguxunawalux.pdf
    • http://cbmdhomesolutions.com/uploads/1/3/0/6/130603890/zepesutag.pdf
    • http://mansfieldmochamber.org/uploads/1/3/0/6/130639681/rokajexepij-makapipebeje-liwakenufuwir-remiwuwevep.pdf
    • http://eewade.com/uploads/1/3/0/2/130273931/liweri_togigojubu.pdf
    • http://varietyvoice.com/uploads/1/3/0/8/130814177/kirego.pdf
    • http://nookwg.com/uploads/1/3/0/5/130551186/173733.pdf
    • http://crazygrlartanddesign.com/uploads/1/3/0/6/130639397/someseze.pdf
    • http://www.heartcentreawareness.com/uploads/1/3/0/7/130739952/pizoxozon.pdf
    • http://xrdsfaith.com/uploads/1/3/0/5/130541445/2364401.pdf
    • http://www.heartcentreawareness.com/uploads/1/3/0/7/130739952/pizoxozon
    • 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_off00007885.bin
8b4ad07252f14b13d3b6c6f2e30bf47055b96f66124561dd3dcc0c0995bb7fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 8172 bytes

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