Malicious PDF — malware analysis report

Static analysis result for SHA-256 0290bec31552b19a…

MALICIOUS

PDF

37.1 KB Created: 2020-06-12 00:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba6d71b1b62d3a44a1d5de9f7d63d42 SHA-1: f5798d2a0af9910f269d17696ab099a1160e9f63 SHA-256: 0290bec31552b19af5b8ed225c3a76618c156b019d0671b04c8002cff03e6b94
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs supports this assessment. No scripts were extracted, but the structure suggests a potential initial access vector via spearphishing attachment.

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://boonecountydrugpreventioncoalition.com/uploads/1/3/0/3/130313098/130313098.html#singing+lessons+indianapolis
    • http://nuwavelocs.com/uploads/1/3/0/2/130272648/89dc2022.pdf
    • http://misssupremepurityqueen.com/uploads/1/3/0/7/130739553/kajikexafi-zadawon-rodunesoxezipo.pdf
    • http://photosbypi.com/uploads/1/3/1/0/131070526/50fbd.pdf
    • http://mx.lighthouseministryintl.org/uploads/1/3/1/4/131409526/pugusabolera.pdf
    • http://springroofrepair.com/uploads/1/3/1/4/131437845/4193701.pdf
    • http://miki1.octarinesec.com/uploads/1/3/0/4/130436299/bituwevukeduvaneru.pdf
    • http://the2hraquarist.com/uploads/1/3/0/6/130604191/6318987.pdf
    • http://precisionsecurity.org/uploads/1/3/1/0/131071062/f3f21d.pdf
    • http://redmoonranch.farm/uploads/1/3/0/5/130588951/9592487.pdf
    • http://broadsword.com.au/uploads/1/3/0/4/130483542/7282143.pdf
    • http://healthyislandsindonesia.com/uploads/1/3/1/3/131379485/105065.pdf
    • http://lemonadeynk.org/uploads/1/3/0/4/130483487/jowazurubo_wagabevud_rinok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rotodiduluf.files.wordpress.com/2020/06/poxexusijekalamuwizus.pdf
    • https://kojumisukure.files.wordpress.com/2020/06/nijemimuvafelepimer.pdf
    • https://butisukumig.files.wordpress.com/2020/06/56777762180.pdf
    • https://bolivuxane.files.wordpress.com/2020/06/sujumoxidivunepu.pdf
    • https://sebakeropi953133814.files.wordpress.com/2020/06/75030279015.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006404.bin
5b2dfc8f1e3259b3f4f4123695d70bca9ac1c870ae41c4cd1519b179418dc538
pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 10360 bytes