Malicious PDF — malware analysis report

Static analysis result for SHA-256 661acd7fc3a5fa1c…

MALICIOUS

PDF

51.3 KB Created: 2020-03-28 03:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4d4d45353f7a1f8ae7ce546c3c84d622 SHA-1: abbe03584ea65d436860ac0c67f50719675a2e48 SHA-256: 661acd7fc3a5fa1cb1003a955bf3e37321ee90846a7c096903e1dc5d464d7cdc
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a potential for distributing further malicious content or redirecting users to phishing sites. The ML classifier strongly flagged this PDF as malicious.

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://firules.com/uploads/1/3/0/5/130543870/130543870.html#pronombres+relativos+en+ingles+traducidos+al+espa%C3%B1ol
    • http://slingstudio.org/uploads/1/3/0/8/130813516/punupeti_fuxuvoge.pdf
    • http://mcisa.net/uploads/1/3/0/6/130604556/tekakifeba.pdf
    • http://livingwhollyme.com/uploads/1/3/0/7/130739522/2266209.pdf
    • http://www.culturemade.org/uploads/1/3/0/3/130379239/nizozun-zarizepelidupad.pdf
    • http://hemisphereintegrationindy.com/uploads/1/3/0/4/130488213/duzugosakit_makutitulilij_vinigibijamawo_gutuzugatuzo.pdf
    • http://stevenvague.com/uploads/1/3/0/4/130435850/xuzezuzopefit.pdf
    • http://momobius.com/uploads/1/3/0/7/130739923/zalinusitobo_totazawe.pdf
    • http://androoms.net/uploads/1/3/0/5/130589287/lepeweru.pdf
    • http://queermainehealth.org/uploads/1/3/0/5/130544318/3322036.pdf
    • http://fwd-momentum.net/uploads/1/3/0/2/130289458/2397793.pdf
    • http://nw4.me/uploads/1/3/0/6/130603919/buwebufimeru.pdf
    • http://cdbpllc.net/uploads/1/3/0/6/130639547/3708989.pdf
    • http://chordradio.com/uploads/1/3/0/5/130588922/gategaletu.pdf
    • http://plasterago-go.com/uploads/1/3/0/5/130541904/joxijejarataw-neleviw-kusezowuxap.pdf
    • http://thepurposefulmama.com/uploads/1/3/0/7/130739544/gufowuxu-xakip.pdf
    • http://inter-agro.net/uploads/1/3/0/7/130739039/f92fa75f3161c.pdf
    • http://catvaloreaza.com/uploads/1/3/0/6/130639573/nepisazusomosix-doxisa.pdf
    • http://www.chicroot.com/uploads/1/3/1/1/131163846/1472540.pdf
    • http://mx.catboxfilms.com/uploads/1/3/0/4/130435906/4839356.pdf
    • http://allwomenallpower.com/uploads/1/3/0/5/130590092/5317161.pdf
    • http://nphscrosscountry.com/uploads/1/3/0/6/130604014/1775501.pdf
    • http://remaxoptima.org/uploads/1/3/0/8/130874490/e7bf05.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c29.bin
3e19ca091072eb7055fbb539ecb445ac932d8d32ad7f4d2d7106a022f36bde90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 9168 bytes
font_01_sfnt_off00009d4b.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4B 2616 bytes
font_02_sfnt_off0000a67f.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA67F 16204 bytes

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