Malicious PDF — malware analysis report

Static analysis result for SHA-256 6042c82ec22f3d8f…

MALICIOUS

PDF

42.2 KB Created: 2020-04-04 08:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ecef29e7d0d8e997b5673a0115eefc3c SHA-1: 26dbce2c029b4adbde6335171da732a8bdc5e379 SHA-256: 6042c82ec22f3d8f61deceea88f6eeaebbf26e02393e07f7494e83e55fbde47d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded document body also contains URLs, such as http://christinabeautyparlour.com/uploads/1/3/0/6/130605443/130605443.html#que+tipo+de+enlace+forma+el+dioxido+de+carbono, which suggests a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://christinabeautyparlour.com/uploads/1/3/0/6/130605443/130605443.html#que+tipo+de+enlace+forma+el+dioxido+de+carbono
    • http://peacefulpanda.net/uploads/1/3/0/4/130488964/6863979.pdf
    • http://spectrum-practice.com/uploads/1/3/0/6/130620459/retomat.pdf
    • http://inspiring-choices.com.au/uploads/1/3/0/6/130621809/fozoxunezusi_pabetim.pdf
    • http://arredimessina.com/uploads/1/3/0/9/130969639/pulakefagalurekom.pdf
    • http://attiremerchco.com/uploads/1/3/0/2/130287871/5515147.pdf
    • http://fpgsolutions.com/uploads/1/3/0/7/130775626/9446879.pdf
    • http://kpugaming.com/uploads/1/3/0/7/130775186/74186204f9a8.pdf
    • http://sastalegal.net/uploads/1/3/0/6/130604594/14279.pdf
    • http://littlegemswarehouse.com/uploads/1/3/0/6/130604557/724e0d87d.pdf
    • http://opal-fig.com/uploads/1/3/0/4/130476423/8749261.pdf
    • http://bobbyselectrical.net/uploads/1/3/0/5/130539798/5c014c044c83f.pdf
    • http://beezcreations.com/uploads/1/3/0/6/130639712/dizilalagapipux.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_off00006ea4.bin
d407167b6afe4e62cadf355cad8105c522c66e30bc7117b324bbab9704ecd0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 8988 bytes
font_01_sfnt_off00008eec.bin
43dc70b6a2d0f0400e5080c2cfef1bfa0583bf77e56b06911b007d479388fc01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEC 3016 bytes

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