Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead81599289b99e…

MALICIOUS

PDF

43.4 KB Created: 2020-06-07 11:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e4bf6413a889858bcc1b9fd208f3727 SHA-1: 52b21041aa10289d572054889c4f24feb624bb21 SHA-256: 7ead81599289b99e67099c06848ad79a50a6dfe402e8960b1c2122ee3ea729c6
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on suspicious domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to Voltaire's Candide and URLs that suggest a lure to download further content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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://bringmethemoney.com/uploads/1/3/1/4/131406153/131406153.html#candide+de+voltaire+r%25C3%25A9sum%25C3%25A9
    • http://joyofsyntax.com/uploads/1/3/0/2/130273845/sininet.pdf
    • http://mimillari.com/uploads/1/3/1/8/131857090/boleme.pdf
    • http://theafricankidsnetwork.org/uploads/1/3/0/6/130620906/jujavixigodurobuzibe.pdf
    • http://mail.kevinsdeli.com/uploads/1/3/1/4/131484395/bd78ebd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://matagef.files.wordpress.com/2020/06/zewotorep.pdf
    • https://kegedepubu.files.wordpress.com/2020/06/xenudatobasopemifedowe.pdf
    • https://xaruxonefi.files.wordpress.com/2020/06/talagik.pdf
    • https://satuxukifowi.files.wordpress.com/2020/06/81355549246.pdf
    • https://pukidolaza.files.wordpress.com/2020/06/ronimuka.pdf
    • https://begopimaxija.files.wordpress.com/2020/06/rezewad.pdf
    • https://leludibowen.files.wordpress.com/2020/06/88547263358.pdf
    • https://vinuvifu.files.wordpress.com/2020/06/joxiretibofuzitageri.pdf
    • https://dasawiduved.files.wordpress.com/2020/06/3688608379.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_off00007933.bin
92be994f8606249ead022bd55d45e56ed122df23c89eb6c80251ea4449445f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7933 12388 bytes

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