Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d0fcf36c3ee8ec…

MALICIOUS

PDF

63.3 KB Created: 2020-06-05 18:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f2e1d06b4310d9c92dc31b41304fc62 SHA-1: 4220e90e1df9096e7126e231633a43e0e60aeae7 SHA-256: 17d0fcf36c3ee8ec258b9cb4fdd6584566f2eae750b70c4333973187eb185c91
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to PDF files with numeric slugs, indicates a likely attempt to manipulate search engine rankings or redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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://forums.jesusradicals.com/uploads/1/3/1/6/131637308/131637308.html#tratado+de+pediatria+nelson
    • http://guthealthreboot.com/uploads/1/3/0/6/130604616/9780823.pdf
    • http://bymissjane.com/uploads/1/3/1/0/131070571/kolepamenegela.pdf
    • http://111-pod.site/uploads/1/3/1/8/131857598/6e052.pdf
    • http://cpanel.hoteljgb.com/uploads/1/3/1/3/131383751/zafovadumiradal_tumamimunigobiw.pdf
    • http://santabarbarasailing.com/uploads/1/3/0/2/130272481/dozox-kimofutipav-bijegumog-beponusinokeko.pdf
    • http://jhp.photography/uploads/1/3/0/5/130589020/nusepuwop_samubaw.pdf
    • http://fishbonedesignnh.com/uploads/1/3/0/5/130540554/keselobe_rotibaseruwatiz_vetufatagiba.pdf
    • http://oxfordshirekickboxing.com/uploads/1/3/1/1/131163980/3471342.pdf
    • http://forums.jesusradicals.com/uploads/1/3/1/6/131637308/terms.html
    • http://forums.jesusradicals.com/uploads/1/3/1/6/131637308/dmca.html
    • http://forums.jesusradicals.com/uploads/1/3/1/6/131637308/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dufamisiril.files.wordpress.com/2020/06/gasiraz.pdf
    • https://tenejokago.files.wordpress.com/2020/06/xitagodasefoga.pdf
    • https://pomosoku.files.wordpress.com/2020/06/31155348968.pdf
    • https://gofiwujuro.files.wordpress.com/2020/06/92549221799.pdf
    • https://jojekuf.files.wordpress.com/2020/06/palogonobesaw.pdf
    • https://kolurujo.files.wordpress.com/2020/06/86886654425.pdf
    • https://timuvamug364737346.files.wordpress.com/2020/06/20066278364.pdf
    • https://rizefoxug.files.wordpress.com/2020/06/42289501235.pdf
    • https://babebevofam.files.wordpress.com/2020/06/32399429832.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_off0000ca6f.bin
8c71330a9fecf6a770b94fc05d00180c30284925b9a7291b9b8e58735adf3b58
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 11432 bytes