Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4b67d38cdb212e…

MALICIOUS

PDF

30.8 KB Created: 2020-03-11 08:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e600f355b4b93b43058c99ef82838506 SHA-1: 8a9ebd7bef930f9b7913545b721ad392f0a638d1 SHA-256: 7a4b67d38cdb212ec3b3d9d2837011202d8e39d8343fee66df70a97d2679410f
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The presence of a link farm heuristic and the ML classifier's high confidence score indicate malicious intent. No scripts were extracted, but the document body and embedded URLs suggest a phishing or redirection attempt.

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://hepburnhideaway.com/uploads/1/3/0/5/130541346/130541346.html#herman+miller+aeron+craigslist
    • http://www.defyinggravity2020.com/uploads/1/3/0/6/130639836/lulumufif_jexeg.pdf
    • http://rodencraterproject.org/uploads/1/3/0/6/130604247/37b21b1054361.pdf
    • http://mxrkz.com/uploads/1/3/0/5/130588773/46a01.pdf
    • http://tonypandytaxiservices.com/uploads/1/3/0/5/130589088/758b3b.pdf
    • http://corneliuscollinsiv.com/uploads/1/3/0/6/130620327/xavolazawunuzamez.pdf
    • http://thegrampo.com/uploads/1/3/0/7/130739212/7176192.pdf
    • http://box52colab.com/uploads/1/3/0/6/130604411/jidas.pdf
    • http://buildnewpower.com/uploads/1/3/0/6/130604531/2589806.pdf
    • http://kristaatkinson.com/uploads/1/3/0/3/130313536/wibitiwus.pdf
    • http://zoolr.com/uploads/1/3/0/7/130739615/be94e203583.pdf
    • http://4thdegree.co.za/uploads/1/3/0/6/130604299/bunigukigupodenu.pdf
    • http://perfectdriving.net/uploads/1/3/0/6/130639364/8618653.pdf
    • http://willbuilddesignerhomes.com/uploads/1/3/0/9/130969080/5776537.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_off000053ba.bin
6a0c8a9f18f20a2ad5dd3ac58aba0c0fcb8ae08b91d861c0f3e520ce70c642f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BA 6208 bytes

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