Malicious PDF — malware analysis report

Static analysis result for SHA-256 749cb8f2f843b065…

MALICIOUS

PDF

82.3 KB Created: 2021-05-18 17:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4729f54f0dd087832c87f8dabcf2747 SHA-1: 2531f2b6b2c8da748c674a51069dce8bf8c9df27 SHA-256: 749cb8f2f843b065011dbb921664519056ec3e18826ef2814c05d43d8dcbb71a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm' by heuristics, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely leveraging embedded JavaScript or other PDF features to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=imc+business+product+catalog+pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6022be8cbd56b.pdf
    • http://xidotamasaw.22web.org/excel_dashboard_template_xls.pdf
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/7207552.pdf
    • https://xipumimetadefol.weebly.com/uploads/1/3/4/3/134358687/vefeludofuzomi.pdf
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600fe7be679fb.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_6068ddf8123a2.pdf
    • https://static.s123-cdn-static.com/uploads/4406481/normal_60053ba711260.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_606635c41a176.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_60397e97a2135.pdf
    • http://movoxazukum.22web.org/xasapepun.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe8277121f36.pdf
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/tuzaf-funozunibaxage.pdf
    • https://cdn-cms.f-static.net/uploads/4421788/normal_5fd97fa690714.pdf
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60302797612ab.pdf
    • https://cdn-cms.f-static.net/uploads/4378404/normal_603e75ca59625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vepilezora.epizy.com/2014_chevy_malibu_haynes_manual.pdf
    • https://uploads.strikinglycdn.com/files/9ecd631e-7263-4506-b86f-ba5c5a8a40cc/tekuzobuvamujotupa.pdf
    • http://legabukev.epizy.com/bayesian_inference.pdf
    • http://zidumaxatu.epizy.com/downtown_philadelphia_map.pdf
    • https://uploads.strikinglycdn.com/files/a7b05878-63d7-4581-83a3-bfd1a2d1ade5/7272865235.pdf
    • https://uploads.strikinglycdn.com/files/434316fe-e22d-4ef1-a426-5ffb0ff0ce82/peferukukowufuvesobelukem.pdf
    • https://uploads.strikinglycdn.com/files/b8f9cfe2-7f7f-49b3-a6a4-1f7dcd4eb6c4/55173016067.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_off00010131.bin
2d0e2c7173523ae39e96d808b232adf8d43eb91f802346aa7c740d95ab23238f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 5552 bytes
font_01_sfnt_off000113f8.bin
433e82599a490ae3d5a0c6982ac67034ab05f406a3e2086b540f9a41af779816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 11140 bytes

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