Malicious PDF — malware analysis report

Static analysis result for SHA-256 066e98f0389b8d86…

MALICIOUS

PDF

32.4 KB Created: 2020-04-18 13:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 67699a6fe7ab47a51e2a211140870d52 SHA-1: f0bdf24e95f1e39892bbbe731adaf9373be07df1 SHA-256: 066e98f0389b8d860b06004db2ce7b59bcc16c7ea5556d5508d92ffc2d16fe9e
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, forming a link farm designed to direct users to a series of other PDF files. The primary lure appears to be a "Gadsden county sheriff booking report" which, upon clicking, leads to a network of SEO-optimized URLs. The ML classifier strongly indicates malicious intent, and the structure suggests a campaign to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://reboundat.com/uploads/1/3/0/2/130287992/130287992.html#gadsden+county+sheriff+booking+report
    • http://breakthroughbeautysecrets.com/uploads/1/3/1/4/131437210/zuzagexuzarajafa.pdf
    • http://banvej.dk/uploads/1/3/0/8/130814010/zasapetiv_jutogobafetu_kuvosijabeluw.pdf
    • http://bamboobrews.com/uploads/1/3/0/7/130739778/rupoxamajarez-jusepi-kakagufaxamilo.pdf
    • http://rantingcritic.com/uploads/1/3/1/3/131398597/eeeafec.pdf
    • http://makiserver.com/uploads/1/3/1/3/131383604/kutiturogixupurasut.pdf
    • http://ultimatecustomecabinets.com/uploads/1/3/0/6/130620751/694155.pdf
    • http://islandstylingirl.com/uploads/1/3/1/3/131398135/dinefagu.pdf
    • http://recklessabandonproductions.com/uploads/1/3/0/6/130621299/jikekunitafakogu.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_off00005898.bin
dfde27a927e1e5ec25ef7e1ab537cccffbac67ebaa37b31244a60c106eeddf26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5898 7432 bytes

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