Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8f8dc5898132de…

MALICIOUS

PDF

40.5 KB Created: 2020-06-17 05:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c608a53d029c93882dbfc7d12f0869 SHA-1: aecf4e206d90c086c729406eb75e16d0df471174 SHA-256: 0a8f8dc5898132de0ddce6102f2713136830dc12504f01d50e29b3e417eb857b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The document body itself contains text related to 'Satanas vende objetos usados pdf descargar', suggesting a lure or scam. The primary function appears to be redirecting users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lg0lr.slpny.com/uploads/1/3/0/6/130605396/130605396.html#satanas+vende+objetos+usados+pdf+descargar
    • http://whittyopinion.com/uploads/1/3/1/4/131453871/koxumexojagizoviwa.pdf
    • http://joginacleaningsolutions.com/uploads/1/3/0/5/130588698/b45ba2.pdf
    • http://aviplan.net/uploads/1/3/0/2/130287842/c8fe5.pdf
    • http://cpanel.goudprijzen.nl/uploads/1/3/1/3/131380803/zudejulaputo-senew.pdf
    • http://montereybaptist.com/uploads/1/3/0/5/130543155/vovodexika.pdf
    • http://germanschool.online/uploads/1/3/1/3/131383332/8765253.pdf
    • http://healthandwellnessteam.net/uploads/1/3/0/4/130436068/jogekaxumu_dajevenebotofi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d7c.bin
3305eea874e2a26a27b3e67a5cc7b8da960e5ed83a7fa3dd946e80a6eee29fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5504 bytes
font_01_sfnt_off00007042.bin
4edb387d41b274e488da79cfc043c8790efc461dbeeea94a8fbfd5f28e802795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 11840 bytes

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