Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bf50486781248e…

MALICIOUS

PDF

47.9 KB Created: 2020-06-13 13:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73e2ed7da3822e10052844ecc07c557d SHA-1: e3ab017a9059279cfe6db816be7d28b204e777fe SHA-256: 75bf50486781248ea659c9e74cbb3750afb36afe76200855bfd500aff59de50c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing attempt designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://soccer.peakathleticsystems.com/uploads/1/3/0/3/130323301/130323301.html#s%25C3%25B3c+r%25E1%25BB%25ABng+gi%25C3%25A1+bao+nhi%25C3%25AAu
    • http://oldcitychalkandsign.com/uploads/1/3/0/5/130551182/8e4efc8974f5a16.pdf
    • http://davidradypc.com/uploads/1/3/0/4/130483508/nawivubo-rizudamis.pdf
    • http://xn--mleriservice-tcb.se/uploads/1/3/1/4/131454359/9489595.pdf
    • http://doxanarrative.com/uploads/1/3/1/1/131163909/lejekizuxirot.pdf
    • http://bosplumbing.com/uploads/1/3/0/5/130538994/fuxesomowigoxojizilo.pdf
    • http://mta-sts.mail.themodestshoptx.com/uploads/1/3/0/7/130775261/1427490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nogilofonula.files.wordpress.com/2020/06/66197090744.pdf
    • https://gapekapanad.files.wordpress.com/2020/06/letusenalutube.pdf
    • https://fafabozum.files.wordpress.com/2020/06/37108725334.pdf
    • https://bedurezagofu.files.wordpress.com/2020/06/39339168838.pdf
    • https://jolemafe.files.wordpress.com/2020/06/sidatodofozu.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_off0000829e.bin
8b55e218004537eaed63d95293f5093d954f6ed29033c8fa65a8754a89666f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829E 22340 bytes

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