Malicious PDF — malware analysis report

Static analysis result for SHA-256 2536dffaa9c6b3bd…

MALICIOUS

PDF

37.4 KB Created: 2020-06-10 13:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba99aa4e940e0cfaeadc8245913d1df SHA-1: c325757a8bd4a2bd7e71ef613e6a62afa8e97801 SHA-256: 2536dffaa9c6b3bdabf972d6946faaf4489c1fbaa015e1e01cc5dd0b2f76365b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML_NYX_PDF_MALICIOUS classifier also flagged this file with high confidence. The primary attack pattern appears to be a link farm, likely intended for SEO manipulation or to distribute further malicious content through the linked PDFs.

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://cpanel.spectrumcounseling.net/uploads/1/3/0/7/130739376/130739376.html#7+arbres+sacr%25C3%25A9s+du+bosquet+des+druid
    • http://blake.business-facebook-covid19.com/uploads/1/3/1/0/131070089/6608362.pdf
    • http://snmfineart.com/uploads/1/3/0/2/130271081/4277605.pdf
    • http://unicorns-are-vegan.com/uploads/1/3/0/4/130483656/mokixevi.pdf
    • http://thelifecoachedlife.com/uploads/1/3/0/3/130379357/6604571.pdf
    • http://eminencefx.com/uploads/1/3/0/7/130776676/28235a0d.pdf
    • http://homesweethomebypatty.com/uploads/1/3/0/4/130477036/01b9614aa3a1136.pdf
    • http://libertasprof.com/uploads/1/3/1/4/131454482/64edce.pdf
    • http://webmail.prodigalsonsinc.org/uploads/1/3/0/6/130605504/xajukivewusabed.pdf
    • http://hostmaster.whitstablefringe.co.uk/uploads/1/3/1/4/131409574/09f1c4.pdf
    • http://jonathangajewski.com/uploads/1/3/0/6/130622013/1695623.pdf
    • https://jepovamofeg.files.wordpress.com/2020/06/ladekokapajegewerizimewim.pdf
    • https://wurataz.files.wordpress.com/2020/06/40128973209.pdf
    • https://ramebebekamu265399452.files.wordpress.com/2020/06/netozafedirozajubuz.pdf
    • https://kedisufod.files.wordpress.com/2020/06/rinepiwi.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_off000062b2.bin
f69185abd522aad325b0ce8f0d96212f6e8ed8e584cdbdefb2800ee27947911a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 11932 bytes

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