Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb30b05d0821693a…

MALICIOUS

PDF

55.1 KB Created: 2020-03-28 12:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd46053ffe1ed57ff1a7b3f80f06048f SHA-1: cb4d5a731ff0490cc9c9f136c3181dcfa9f917aa SHA-256: eb30b05d0821693adbdb880900edec6d202da5aa7ef24e04d0693d533b835c5b
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 pattern is indicative of a link farm or SEO poisoning attack, designed to drive traffic to a network of sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body content is heavily obfuscated, making it difficult to determine a more specific intent beyond link redirection.

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://petradiamondsetting.com/uploads/1/3/0/4/130476401/130476401.html#herbert+marcuse+aportaciones
    • http://chinashop-rodeo.com/uploads/1/3/0/7/130775451/4587898.pdf
    • http://3bbabyblankets.com/uploads/1/3/0/5/130547069/faragasodubur.pdf
    • http://www.thesecretartloft.co.uk/uploads/1/3/0/6/130639672/177859.pdf
    • http://hostmaster.deddingtonscouts.org.uk/uploads/1/3/0/3/130323517/6442b4e1e73.pdf
    • http://www.ekhypnotherapy.com/uploads/1/3/1/0/131070497/towuvewogewu.pdf
    • http://gemmasage.com/uploads/1/3/0/6/130621098/siravovemax.pdf
    • http://www.wraparounddoulaservices.com/uploads/1/3/0/5/130551369/wemebavaxejuro_jivawotizagimu_zitejotugikam.pdf
    • http://optimizacoaching.com/uploads/1/3/0/7/130739103/6478369.pdf
    • http://latercomics.com/uploads/1/3/0/4/130436313/popupi-pirapojiku-kedaxubosewib.pdf
    • http://newlifewatersolutions.com/uploads/1/3/0/5/130551222/solixetezigi.pdf
    • http://noahdebiase.com/uploads/1/3/0/2/130287937/846869d7cef14.pdf
    • http://gallerypierre.com/uploads/1/3/0/7/130775115/voviro.pdf
    • http://tarirefa.com/uploads/1/3/0/5/130539255/7969221.pdf
    • http://storageunitscenter.com/uploads/1/3/0/7/130775598/b749272de2c.pdf
    • http://inmyday.net/uploads/1/3/0/5/130589214/jipewugim.pdf
    • http://restoredsimplicity.com/uploads/1/3/0/2/130270898/pufixexupofogefato.pdf
    • http://nvarealestateresource.com/uploads/1/3/0/7/130776331/koxedopugigubomalev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dc4.bin
4eec3ee9f326d7a7dff7d049f63031d7c0e511bfd7cbdee428cdaa190740710f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC4 9224 bytes
font_01_sfnt_off0000aebc.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 2652 bytes
font_02_sfnt_off0000b823.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB823 16036 bytes

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