Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bb791a4ac28fb1…

MALICIOUS

PDF

49.5 KB Created: 2020-03-11 06:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d05528f54956660f9a9215e5b70bdd3 SHA-1: dd11e130b28e15f18958feba734d695c73a2396a SHA-256: 81bb791a4ac28fb18a7f9142213627fc10738177139f20c5a4cf2ada8ec74dea
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user or manipulate search engine results.

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://amh2sl.salon225.com/uploads/1/3/0/8/130814186/130814186.html#pdf+file+splitter+software+online
    • http://nerieconst.com/uploads/1/3/0/6/130620898/modulekuvamula.pdf
    • http://www.therapybycamille.com/uploads/1/3/0/6/130621000/tosukinugazi.pdf
    • http://chattanoogacigar.com/uploads/1/3/0/7/130776253/mixef_bilidok.pdf
    • http://southsidetower.org/uploads/1/3/0/2/130289467/wosuked.pdf
    • http://newlifeh2o.com/uploads/1/3/0/6/130639777/bfcd6d7e3bb8.pdf
    • http://classicmassagestudio.com/uploads/1/3/0/6/130621477/e054170.pdf
    • http://74-123-72-176.mgwnet.com/uploads/1/3/0/2/130270763/gerosenuj.pdf
    • http://northcarolinafishingbooks.com/uploads/1/3/0/8/130873717/kujovikuteguseti.pdf
    • http://mta-sts.mail.rosebudbirthingservices.com/uploads/1/3/0/2/130273803/fobinadumikifuvimel.pdf
    • http://chasehouser.com/uploads/1/3/0/8/130814241/lunilomixeludijup.pdf
    • http://www.explorecitygr.com/uploads/1/3/0/4/130476548/xategapajevo-sidivukara-dorulunise-sumiwod.pdf
    • http://myescondidosoccer.com/uploads/1/3/0/5/130551127/bumupixe-zuzijujoj-xusujazinozu.pdf
    • http://acupunctureexpress.com/uploads/1/3/0/2/130289201/kokasomija_gutejowadapoju_zodivi_sigaropilefofex.pdf
    • http://elpc.biz/uploads/1/3/0/3/130323362/wuwikutaduxaxom_bibabunime_vumewem.pdf
    • http://protarian.com/uploads/1/3/0/4/130476203/tesebejadoz-revax.pdf
    • http://lostjedis.net/uploads/1/3/0/3/130323229/4969800.pdf
    • http://danielreist.org/uploads/1/3/0/6/130639653/fuwew_vudinufifama_werat_wiwalemof.pdf
    • http://www.destinypathcorp.com/uploads/1/3/0/7/130776518/647a349b.pdf
    • http://74-123-72-70.mgwnet.com/uploads/1/3/0/7/130739809/boxegizo.pdf
    • http://huyhieuvietnam.com/uploads/1/3/0/5/130551728/fixitabiboji-malinitakaravuw-lugevudabipanol.pdf
    • http://prevenseskincare.com/uploads/1/3/0/5/130588591/ff1d7517771260.pdf
    • http://www.rosieprobert.co.uk/uploads/1/3/0/7/130738963/1dacc.pdf
    • http://metalseinen.com/uploads/1/3/0/4/130436136/5cd38dd9b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ef7.bin
e31c1d81c1630c920bfe4166c77994d362dac587c132e54b4ebd8341bcc49bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 8168 bytes
font_01_sfnt_off0000ae9a.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9A 2652 bytes

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