Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b37af3eafb60daf…

MALICIOUS

PDF

40.7 KB Created: 2020-03-25 07:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ebed1d092bf89af837f9fb18df2f4d1e SHA-1: 9d8ce3b79426b1755aae3e7d79cba6aec19ea935 SHA-256: 0b37af3eafb60daf48a8ad83a3ddbaf09fbc03c7dd1b55f18cb284b9d3e2d4f6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links to various domains, identified as a PDF link farm. The ML classifier strongly indicated maliciousness. The embedded document body text is heavily obfuscated and contains some of the URLs, suggesting a lure to external content. The primary purpose appears to be SEO manipulation or distributing further malicious content via the numerous linked PDFs.

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://chemaroma.org/uploads/1/3/1/3/131383679/131383679.html#cual+es+la+organizacion+politica+de+los+romanos
    • http://74-123-79-160.mgwnet.com/uploads/1/3/0/9/130968934/xijof-julemadatabosu-besuliforijije-tikaxid.pdf
    • http://mariamexpopresentation.com/uploads/1/3/0/6/130639931/mipupidiboluwugajoge.pdf
    • http://www.protrip.cz/uploads/1/3/0/3/130313555/8049340.pdf
    • http://ndmbfc.com/uploads/1/3/0/5/130550681/xafeba-zojobakemozeke.pdf
    • http://senaylanguageconsulting.com/uploads/1/3/0/9/130969535/nubupugox.pdf
    • http://chuyitos.com/uploads/1/3/0/4/130477346/lolesag.pdf
    • http://melissaneckphotography.com/uploads/1/3/0/2/130270924/demogaza_gevukona_wikuzafuvebuva_bumaborezune.pdf
    • http://lolempower.com/uploads/1/3/0/3/130324440/9286888.pdf
    • http://noahcaseycounselling.com/uploads/1/3/0/8/130814630/kifizu.pdf
    • http://campingdeberghoeve.com/uploads/1/3/0/5/130588827/ladobimix.pdf
    • http://decrisis.org/uploads/1/3/0/5/130551651/gipopiliwov-bimuvodaluresa-dekis.pdf
    • http://jcslawncare.net/uploads/1/3/0/7/130776779/2894827.pdf
    • http://355cochrane.com/uploads/1/3/0/2/130271205/5266a09499acd2a.pdf
    • http://amberoni.com/uploads/1/3/0/8/130814106/loliwirova.pdf
    • http://yusifmirzastudio.com/uploads/1/3/0/2/130289554/falujatidijo-dunuterizuso.pdf
    • http://hirschbiology.com/uploads/1/3/0/5/130550665/83a6e773.pdf
    • http://www.allieplatt.com/uploads/1/3/0/7/130775222/mafiviwugaroj.pdf
    • http://excelsolutions.net/uploads/1/3/0/9/130969570/4634366.pdf
    • http://www.thesupporthelp247.com/uploads/1/3/0/6/130639867/gaxelewijuj.pdf
    • http://www.sierrajamesmassage.com/uploads/1/3/0/7/130738885/zubirelozi.pdf
    • http://girlfridayottawa.com/uploads/1/3/0/3/130323400/3453083.pdf
    • http://sugarcreekmbc.org/uploads/1/3/0/6/130622084/c7df399.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_off000074c2.bin
3211d7ee00f35004bece32364323c2caeb4cf1d4022ff5c54a41193467e3877a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C2 8464 bytes

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