Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e08e7b2909ce91d…

MALICIOUS

PDF

36.1 KB Created: 2020-06-02 09:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f83b2e86d4c772c7ac8776867413f40c SHA-1: 600d6bad928b025f923eb5e7f95d2f5297fa6d29 SHA-256: 6e08e7b2909ce91ddcc780d04c75b6911779dab261d731d2deb5c86564f146f5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the PDF structure itself is indicative of a link farm or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hostmaster.ubaan.nl/uploads/1/3/0/2/130270874/130270874.html#holt+mcdougal+modern+chemistry+book
    • http://hollieferris.com/uploads/1/3/1/4/131437074/411721.pdf
    • http://mingsheng88yulecheng.br3h.com/uploads/1/3/1/8/131856523/kuvomakolitu.pdf
    • http://julycreations.com/uploads/1/3/2/3/132302716/pofewi.pdf
    • http://leibforpa.com/uploads/1/3/0/5/130551239/0efa4af087fb.pdf
    • http://hostmaster.ubaan.nl/uploads/1/3/0/2/130270874/terms.html
    • http://hostmaster.ubaan.nl/uploads/1/3/0/2/130270874/dmca.html
    • http://hostmaster.ubaan.nl/uploads/1/3/0/2/130270874/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wofopisuf.files.wordpress.com/2020/05/61592193956.pdf
    • https://lulerodibo.files.wordpress.com/2020/05/redibugonufekukusolok.pdf
    • https://xufukimeva.files.wordpress.com/2020/05/31845045461.pdf
    • https://detezunugola.files.wordpress.com/2020/05/fokarekunewi.pdf
    • https://lexipawe.files.wordpress.com/2020/05/mafuzo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611e.bin
f6a7687d4ec171a301bfb19aa857b24824e21b06e900214704dd14b81be1cda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611E 10608 bytes

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