Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eaf995bec8c5622…

MALICIOUS

PDF

41.9 KB Created: 2020-06-03 23:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6505c70a99a6bf459188220d0f5cd3b SHA-1: ccbaf26b716ea6b9e1916cd1ca5b62f6ae23592b SHA-256: 0eaf995bec8c56229d036af8107c6b9c7147ad6793d7b2a48b0ab4c56242b5ea
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting a link farm or redirection scheme. The embedded URLs, such as http://74-123-75-232.mgwnet.com/uploads/1/3/1/8/131856380/131856380.html#computer+networks+tanenbaum+pdf, are likely part of this scheme to distribute malicious content. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution 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://74-123-75-232.mgwnet.com/uploads/1/3/1/8/131856380/131856380.html#computer+networks+tanenbaum+pdf
    • http://220-jillcohen.iaany.org/uploads/1/3/0/9/130969568/29864be.pdf
    • http://hausundgartenservice.org/uploads/1/3/0/2/130272081/gesenet.pdf
    • http://everest-edition.com/uploads/1/3/0/6/130621649/c316a887eab7.pdf
    • http://smart-touchscreen.com/uploads/1/3/0/7/130739926/8039848.pdf
    • http://indigosoapworks.com/uploads/1/3/1/8/131856394/golulamazezunom_xurujulijibig.pdf
    • http://whitneyblairnorris.com/uploads/1/3/0/7/130775304/5013559.pdf
    • http://mail.vape3one.com/uploads/1/3/0/7/130775920/dd9e4097.pdf
    • http://chaplainscollege.education/uploads/1/3/0/2/130289304/9795215.pdf
    • http://revras.org/uploads/1/3/0/8/130873861/514414.pdf
    • http://autodiscover.jzplabelling.com.au/uploads/1/3/0/9/130969030/jilipodam_nuleruwawatagi.pdf
    • http://cpgclasses.com/uploads/1/3/0/2/130287977/2a302f4f8.pdf
    • http://nnkn.blog/uploads/1/3/1/4/131437780/lezosekimulefav_sojar.pdf
    • http://eva-uhhhh.com/uploads/1/3/1/8/131872054/tufajusabigu.pdf
    • http://74-123-75-232.mgwnet.com/uploads/1/3/1/8/131856380/terms.html
    • http://74-123-75-232.mgwnet.com/uploads/1/3/1/8/131856380/dmca.html
    • http://74-123-75-232.mgwnet.com/uploads/1/3/1/8/131856380/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dalotefak.files.wordpress.com/2020/06/sijewomiwowiwusulut.pdf
    • https://pidogodunit.files.wordpress.com/2020/06/dupafofa.pdf
    • https://tejizofuraxi.files.wordpress.com/2020/06/desitiliziliwesadenezo.pdf
    • https://tetubupi.files.wordpress.com/2020/06/57049110842.pdf
    • https://vikotefo.files.wordpress.com/2020/06/ronelurojuri.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_off0000766b.bin
dbe5874f69b0ad70ca73bb63cfe48ee4eff6dd4434f7e7beb7a26f98b30f01c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 10304 bytes