Malicious PDF — malware analysis report

Static analysis result for SHA-256 79eb84e713f6b71a…

MALICIOUS

PDF

36.5 KB Created: 2020-06-16 13:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51daa08bd4a7c2cc327910030e9bbd88 SHA-1: d8a2c725a5b924149cc404d170b4634763f6a35c SHA-256: 79eb84e713f6b71aad98047fc15a07246acd15a66333f4e3537630cd0fe76a46
96 Risk Score

Malware Insights

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

The PDF contains numerous external links to other PDF files, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to potentially harmful content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://maximemetalcreations.com/uploads/1/3/0/7/130739936/130739936.html#sat+act+practice+test+answers
    • http://mail.accutypeservices.com/uploads/1/3/0/7/130739754/sorefevok.pdf
    • http://wvwmb51.pensioenblik.nl/uploads/1/3/0/5/130589205/juximun.pdf
    • http://divinedesserts-tt.com/uploads/1/3/0/6/130604539/c5f18f08b35.pdf
    • http://mx.immlawcounsel.com/uploads/1/3/0/7/130739280/8152037.pdf
    • http://1yx.undesirable.us/uploads/1/3/1/4/131437885/5361286.pdf
    • http://wsdcdebate.com/uploads/1/3/0/6/130604731/jarulu_gufegitezodut_jajul.pdf
    • http://kometaniassociates.com/uploads/1/3/1/3/131383726/midujegupukunotij.pdf
    • http://deluxedancemovement.com/uploads/1/3/1/8/131856039/3d31ac808531b8.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f2.bin
1d39a13c21875751e9ed60d19264fd7fba1f9db1541d8617ea020642b9d9d38a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F2 10500 bytes

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