Malicious PDF — malware analysis report

Static analysis result for SHA-256 5219d33e0f8171c8…

MALICIOUS

PDF

36.5 KB Created: 2020-06-06 18:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90473b35762c9a90a0e27c4f1985dd9 SHA-1: e7e5663308f54da3843e244c9c8f3555cfa63ee4 SHA-256: 5219d33e0f8171c84d12def5542382325ea1618d254fb1f21134a6af0c218768
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1598.002 Host Discovery: Host Append

The PDF file 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 embedded document body text, though heavily obfuscated, contains several URLs that are likely part of a link farm or redirection scheme. The primary attack pattern appears to be SEO manipulation or directing users to malicious content hosted on external sites.

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://xn--jordnraupplevelser-ptb.se/uploads/1/3/1/8/131857241/131857241.html#a+conspiracy+of+kings
    • http://southernparkway.com/uploads/1/3/1/8/131872082/b5a83e1d92cdde.pdf
    • http://pastorlee.org/uploads/1/3/1/4/131411197/lipagu.pdf
    • http://undercovernetwork.com/uploads/1/3/0/7/130740242/7864329.pdf
    • http://xn--jordnraupplevelser-ptb.se/uploads/1/3/1/8/131857241/terms.html
    • http://xn--jordnraupplevelser-ptb.se/uploads/1/3/1/8/131857241/dmca.html
    • http://xn--jordnraupplevelser-ptb.se/uploads/1/3/1/8/131857241/policy.html
    • https://pegizibi.files.wordpress.com/2020/06/wolezuwagigoz.pdf
    • https://fumupidix.files.wordpress.com/2020/06/50499500183.pdf
    • https://xolupola.files.wordpress.com/2020/06/durosotazirigimexuf.pdf
    • https://bixewumon.files.wordpress.com/2020/06/61679173868.pdf
    • https://datarelozaw874436251.files.wordpress.com/2020/06/50221212080.pdf
    • https://turajudodaj.files.wordpress.com/2020/06/21895641622.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_off000063c7.bin
bd8546d386107aa735f48e268c9ef3a1238bd4acd2f5a7cca34369ec1050a041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 10528 bytes

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