Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db22729c1712fb…

MALICIOUS

PDF

73.9 KB Created: 2021-03-14 23:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b88c8755b3ad920df5150e106994a0 SHA-1: 229ea98575519ac2047e04e227398ebe3838b161 SHA-256: c3db22729c1712fbe97086eaad45e11e0e286d3533a4b552175bf95b751a5bf5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and SEO link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://druttle.ru/award?keyword=cabalistic+encyclopedia+david+godwin+pdf
    • https://cdn-cms.f-static.net/uploads/4477183/normal_601db4647e212.pdf
    • https://cdn.sqhk.co/jovakuki/wghibx2/testdisk_wiki_guide.pdf
    • https://cdn.sqhk.co/fofasafiwi/gpLKxjf/rowugiriruda.pdf
    • https://cdn.sqhk.co/xuxozowaki/gGihWpf/coc_server_clash_of_magic.pdf
    • https://cdn-cms.f-static.net/uploads/4498702/normal_603bd6133e612.pdf
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601100295c403.pdf
    • https://cdn-cms.f-static.net/uploads/4382781/normal_6011deff4148c.pdf
    • https://cdn.sqhk.co/tumowara/hcAdjad/20240519490.pdf
    • https://static.s123-cdn-static.com/uploads/4489843/normal_6000cf8c12a8b.pdf
    • https://cdn.sqhk.co/gojelonub/YXuh3hc/gedeter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0f38b60e-930b-4093-bd8d-2d687c694e5c/how_to_use_kindle_touch_instructions.pdf
    • https://s3.amazonaws.com/viromibukoleliw/6359683588.pdf
    • https://s3.amazonaws.com/bezorito/gufowezireminokudolaz.pdf
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_14426ea0deeb4f9c84d5f9841fdff23e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1f2da01-fa60-4727-874f-eb4b7edac03b/vilisuzolirovopekix.pdf
    • https://s3.amazonaws.com/vatakefojunib/6210098401.pdf
    • https://uploads.strikinglycdn.com/files/2b8383b4-47f2-4a8e-a547-4718865c8da4/gobigivarusuzekuju.pdf
    • https://s3.amazonaws.com/zolerazowubow/seo_competitor_analysis_report.pdf
    • https://uploads.strikinglycdn.com/files/3be8310e-ef30-4cc5-b347-6f2d90bcc30f/how_do_you_install_swiftlock_flooring.pdf
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_5a9fa196f4d5492eb53d70876d69f94d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8ddea42-44c4-436b-b07a-448b8fe9733e/2004_chevy_malibu_maxx_oil_type.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_off0000e395.bin
f65143a87e10e269fba3c0cc9378dd7945f6a494128cbe76d0fab4d0be085828		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 5524 bytes
font_01_sfnt_off0000f68d.bin
1dd38959e29128f963e72d717be7d913501aeccddefc1f9b7da6de25b2c254bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10504 bytes

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