Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfecc9c38d8466a6…

MALICIOUS

PDF

72.6 KB Created: 2021-04-06 11:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3e1e93f14da7a0fa3b53a608055a5dd SHA-1: d529e5a209d31ece0b7289b4a710302832a51204 SHA-256: cfecc9c38d8466a6c2d4ddfa0b6fc76a1e62701af39980ecd56e339cd02105c0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm pointing to `http://wuxosalilujaza.atwebpages.com/58506032542.pdf`. Another external URI `https://xezojetit.ru/strik?utm_term=similes+and+metaphors+worksheet+grade+6` is also present. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=similes+and+metaphors+worksheet+grade+6
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5ffcc5a966d0a.pdf
    • https://cdn-cms.f-static.net/uploads/4426967/normal_6018824798ae9.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_6009cf7626ec1.pdf
    • http://fogejebimo.scienceontheweb.net/sample_bookmark.pdf
    • https://cdn-cms.f-static.net/uploads/4467274/normal_605670fb1a7d0.pdf
    • http://tofotibuwul.sportsontheweb.net/vafusawe.pdf
    • https://cdn-cms.f-static.net/uploads/4459776/normal_6011645e9dc95.pdf
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fde413af1120.pdf
    • http://narawodosure.medianewsonline.com/89983890004.pdf
    • https://cdn-cms.f-static.net/uploads/4383806/normal_605c395dd15c0.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fd7f38a2152c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuxosalilujaza.atwebpages.com/58506032542.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_50d7edb0912d4786af254366c04371b5.pdf?index=true
    • http://sabodivatipapan.epizy.com/vernier_caliper_gujarati.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_36d90bc8b3a94fc8ade7de2239d8b9e7.pdf?index=true
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_54abd16447314414bd76c8bc65e37f63.pdf?index=true
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_dc91aa718e05411fa02c54423928559e.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_7f2e0dd89a534443894394c896040f4b.pdf?index=true
    • http://pevipitoz.atwebpages.com/84606792204.pdf
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_54e1464228ca4225b5b602c58e680009.pdf?index=true
    • http://gaposajalumawes.rf.gd/50285077459.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_563aff25ea06465f815c26eabc056893.pdf?index=true
    • 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_off0000dcc6.bin
5bfc9cba97290827531ccb9c0958f20ccd65178f7c37cc7eed1d153f8aefec8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 5788 bytes
font_01_sfnt_off0000f056.bin
f622d354c06b58a12ebfe1546fd3d378e59d5048497aec27b4d9391b28011f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 10760 bytes

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