Malicious PDF — malware analysis report

Static analysis result for SHA-256 67def5147cd1aeec…

MALICIOUS

PDF

42.9 KB Created: 2020-03-29 15:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4619066c628a4dcbcf6cff59801ae60e SHA-1: e0379f58be6957b7e4581bad5527ed6d4710cc72 SHA-256: 67def5147cd1aeeca92b5ca06381514a06b06a34ee3db055672da5f2df92d7c3
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs pointing to similarly structured domains supports the assessment of a link farm designed to distribute or host further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://waterfronthotel.devsite-1.com/uploads/1/3/1/3/131381901/131381901.html#amargo+angostura+que+tipo+de+licor+es
    • http://havanesesouthafrica.com/uploads/1/3/0/7/130775619/nifanaxofo_mabivadepop.pdf
    • http://frijolespuercos.net/uploads/1/3/0/8/130874285/6642712.pdf
    • http://thetakappazeta.com/uploads/1/3/0/9/130969086/8788597.pdf
    • http://africachildrenhope.net/uploads/1/3/0/7/130738972/nogivupuro-lapemab.pdf
    • http://letthemshine.net/uploads/1/3/0/9/130969264/moboweki.pdf
    • http://yogalkn.com/uploads/1/3/1/3/131378780/a55aa18997affc.pdf
    • http://scovnaturalwellness.com/uploads/1/3/0/3/130323329/tukip_feloxupexes_jofenekaroji_bobevajumu.pdf
    • http://jillysconfections.com/uploads/1/3/0/4/130476372/2113795.pdf
    • http://bgiapts.com/uploads/1/3/0/2/130287221/pupimukidudavof_temiwow.pdf
    • http://christfreedombiblechurch.org/uploads/1/3/0/4/130483759/xatasowova.pdf
    • http://limitless-leaders.com/uploads/1/3/0/4/130476751/1168981.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_off00007166.bin
9e21719c271dd0623f251b78281816c370aec231bcec4234167d73aa649c7308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 9372 bytes
font_01_sfnt_off00009326.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9326 2596 bytes

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