Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebb84a0d6a1a019…

MALICIOUS

PDF

41.8 KB Created: 2020-03-27 04:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f40314d809cc60a8286f534ad35d9f94 SHA-1: acb24bc3f28aee2b0d45aeed3c688568416b1c87 SHA-256: 4ebb84a0d6a1a0192c3bbee7c6ce446af7f87b893292666928be7cb1418295ee
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body text is largely unreadable, but the presence of numerous links to external PDF files suggests a link farm or distribution mechanism for further malicious content. The primary intent appears to be directing users to a network of compromised or attacker-controlled domains.

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://mitco-solutions.com/uploads/1/3/0/3/130313173/130313173.html#secuencia+didactica+numeros+del+1+al+10
    • http://sonnys-closet-trade.com/uploads/1/3/0/8/130874429/xelemonumev.pdf
    • http://on-linefilmschool.com/uploads/1/3/0/6/130639934/duvekoxar.pdf
    • http://floridatrailrides.com/uploads/1/3/0/5/130543020/duxupi-nuwolunanimu.pdf
    • http://www.shop-brokenlimits.com/uploads/1/3/1/0/131070192/fedasusaruxulaz_wupurivejiwu_mimowiridotav.pdf
    • http://bizcamp.be/uploads/1/3/0/2/130270993/tonefo_xoruxanitu.pdf
    • http://jacquicouture.com/uploads/1/3/0/8/130874583/9948057.pdf
    • http://hattrickvideo.com/uploads/1/3/0/2/130289800/c3845.pdf
    • http://themickiestore.com/uploads/1/3/0/7/130738945/nivozoxukopopub_vurakilotegez.pdf
    • http://pacificore.com.au/uploads/1/3/0/4/130435717/7f9bdc11d.pdf
    • http://andrewleepost.com/uploads/1/3/0/2/130271207/wumugavu_peweromukixusu_lidifejewere.pdf
    • http://triosimplant.com/uploads/1/3/0/5/130543552/5213f3949d2e5d.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_off000077ac.bin
5bba033a9195184374639f8c2b03bd35d0c7acaa069a79f9e0d1875150ef7dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AC 9384 bytes

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