Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeaf4cbb853c245…

MALICIOUS

PDF

39.5 KB Created: 2020-05-23 12:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2080c889b29905cee45822a2b8696e23 SHA-1: 7261019a51ca868ef82ccc5245bd96d3cfe7eec3 SHA-256: deeaf4cbb853c24507ddfb6f7867f75221cee67c0a207615297d714125d70f3f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, masquerading as a "Javascript tutorial pdf free full". The heuristic PDF_SEO_LINK_FARM indicates that this is a link farm designed to manipulate search engine results. The ML classifier strongly supports the malicious nature of this document. The primary attack pattern involves directing users to numerous external websites, likely for SEO spam or to host malicious content.

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://azerah.trevelle.com/uploads/1/3/0/5/130588494/130588494.html#javascript+tutorial+pdf+free++full
    • http://elpicositocatering.com/uploads/1/3/0/4/130436136/3336774.pdf
    • http://borealbooks.com/uploads/1/3/0/2/130289254/7321537.pdf
    • http://outcomedisabilityservices.com/uploads/1/3/1/4/131455621/relukakukebale.pdf
    • http://kimvandoren.com/uploads/1/3/0/5/130589353/b5ec1463.pdf
    • http://imfrida.com/uploads/1/3/1/0/131070490/331010.pdf
    • http://kidolito.com/uploads/1/3/0/5/130550976/d362a1.pdf
    • http://ajmemorialevent.org/uploads/1/3/0/9/130969878/rizoniriwujaru.pdf
    • http://sensoryworx.com/uploads/1/3/0/4/130488172/wefaxewosisib.pdf
    • http://medi-techs.com/uploads/1/3/0/5/130545199/02189505481533d.pdf
    • http://frunzademac.com/uploads/1/3/0/2/130288554/xudamenalitavim_lutetuw.pdf
    • http://skyviewtrucking.com/uploads/1/3/0/5/130551824/d9bad66c8af4cd3.pdf
    • http://orchidroadorganics.com/uploads/1/3/1/4/131438419/5865311.pdf
    • http://crystal-vision-consultants.org/uploads/1/3/1/4/131483445/bb47a4.pdf
    • http://hostmaster.thecosimomatassaproject.com/uploads/1/3/0/2/130270753/f8b988f.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_off00006ee7.bin
237116ca8138122b0d6ddff24b67592e7e4dbb6734688aee68a19ff6629063ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE7 10508 bytes

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