Malicious PDF — malware analysis report

Static analysis result for SHA-256 731265d518f6cb65…

MALICIOUS

PDF

36.6 KB Created: 2020-03-29 06:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 45d1da8817b8f2ddc89ae842a8044c43 SHA-1: 73d5eb7e5d58dabb3424c9e5a7279ce3056a3fa0 SHA-256: 731265d518f6cb656563455c214a50ea8ace2d6f6687dfdebee40fc1cfc6b7f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to URLs that are part of this link farm, suggesting a coordinated effort to direct users to potentially malicious websites.

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://seastar.websalve.com/uploads/1/3/0/6/130620730/130620730.html#scarlet+letter+chapter+12+quizlet
    • http://thetranquilgoat.com/uploads/1/3/0/2/130272610/xoralojokewu.pdf
    • http://progresstm.com/uploads/1/3/0/8/130874015/7c1994718b.pdf
    • http://clkfarm.com/uploads/1/3/0/6/130620678/4534145.pdf
    • http://www.acrowscalling.com/uploads/1/3/0/4/130479082/7fc23eab6c810f.pdf
    • http://granvillebates.com/uploads/1/3/0/7/130776478/8027846.pdf
    • http://mobilenaturalmedicine.com/uploads/1/3/0/9/130969700/a7ceb743b8.pdf
    • http://thomspongaydenreunion.com/uploads/1/3/1/1/131163841/gijabakixaref.pdf
    • http://carexlakewood.com/uploads/1/3/0/6/130620384/juwepel-bikaxir-mizemapevudajo.pdf
    • http://blacksinphilanthropy.com/uploads/1/3/0/3/130379326/rirowanutufuw-vajetowatigepes-fuzibesad.pdf
    • http://gibydarcy.com/uploads/1/3/0/5/130541623/f1765d24ca.pdf
    • http://vlcoa.com/uploads/1/3/0/3/130323515/wafuvufajaj.pdf
    • http://owngov.net/uploads/1/3/0/2/130289171/kisobaj-motub-vawos.pdf
    • http://cafefresco48.com/uploads/1/3/0/6/130621206/7038b2de97c0815.pdf
    • http://oscarmasonry.net/uploads/1/3/0/2/130270905/c9e88dc4f1783.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_off00005ee1.bin
3b518d7c56cfceb766329bae26ccaec9bd72c16c0c9de854c6813366d878946b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE1 7204 bytes
font_01_sfnt_off00007b3b.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3B 2652 bytes

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