Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9db9e0fab98341…

MALICIOUS

PDF

43.9 KB Created: 2020-04-07 10:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c40790086f9674126f8f79efee9d2de5 SHA-1: 2bea04581e567020880eb4573b5bdac3102b2da1 SHA-256: 5b9db9e0fab983419e747aa0e2ebd9a705fd19144927aa6cc6a455489afff6e4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs suggests a redirection or content-loading scheme. The document body itself is largely obfuscated, but the embedded URLs are the primary indicators of malicious intent.

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://fullhousefamilymovers.com/uploads/1/3/0/4/130435688/130435688.html#the+which+way+tree+discussion+questions
    • http://clarencevalleyworkingequitation.com/uploads/1/3/0/8/130874305/kuzurik_mugegulijiwev_kajegimadamexog_jonigi.pdf
    • http://laprairie-bella.nl/uploads/1/3/0/9/130970023/fimiju-goguzowuva-dovebu-tagevinukajazur.pdf
    • http://linahaskelportfolio.com/uploads/1/3/1/3/131379362/6869328.pdf
    • http://adentamalaysia.com/uploads/1/3/0/5/130590082/1233939.pdf
    • http://heilelaw.de/uploads/1/3/1/0/131071117/pupopazosegimidifufe.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_off000079c8.bin
c5af32a0455e088ffb9e59fca1c6c89e2b898663702698aceda9426c27450fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 8248 bytes
font_01_sfnt_off00009959.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9959 2596 bytes

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