Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72a0c52630912d9…

MALICIOUS

PDF

115.6 KB Created: 2021-02-15 01:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6f92699de39a43f75b482d4e66c4b5 SHA-1: eeb5213d970692a36cde310f3817c6e0af05a2de SHA-256: b72a0c52630912d962d1df57dc62a0c6491a4d68f00cba307960df8473e67931
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://maypoin.ru/wix?keyword=modern+japan+social+structure, are likely used to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://maypoin.ru/wix?keyword=modern+japan+social+structure
    • https://cdn-cms.f-static.net/uploads/4392647/normal_6024346da042d.pdf
    • http://miiliioner.xyz/64572406221vsacb.pdf
    • http://ogranicbio.fun/dogarovv5m6w.pdf
    • https://static.s123-cdn-static.com/uploads/4476429/normal_5ff9298f9efea.pdf
    • https://cdn-cms.f-static.net/uploads/4471711/normal_60289382af286.pdf
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600dd9a411b7b.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/6931e3377e538.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fd0a5af8afb8.pdf
    • http://50off.pro/88184027284ul1e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tojazudibumogab/tiravefezinekajum.pdf
    • https://s3.amazonaws.com/jagux/8340589626.pdf
    • https://s3.amazonaws.com/libosokune/xikibolegupoxopakukevelu.pdf
    • http://jigiwema.epizy.com/alt_j_deadcrush_song.pdf
    • http://mujedofagogi.epizy.com/certificate_samples.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c41.bin
4f130f889ac6800808c912e4292c102a134695cf56e3109a4d0cf4c9cf6ee745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C41 5148 bytes
font_01_sfnt_off00019de1.bin
69da8e72a6e0795758f0125c87304496c5d9918582301e6dc898c3ec21ac20bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE1 10452 bytes

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