Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71bfbd049d4b819…

MALICIOUS

PDF

229.5 KB Created: 2021-02-19 09:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 206dcccdbc5aa7557f33dfb8fb498f52 SHA-1: 5b81234032fd66dd70883450c6c5a2696036a78e SHA-256: b71bfbd049d4b81921c3b804c8c45dcac630d69a01083ad54559c0678fa2b655
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency language in the document body, combined with numerous embedded URLs, suggests a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript for malicious actions, and the heuristic 'PDF_URI' points to an external URL likely serving a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/wix?keyword=kira+lee+painter PDF link annotation
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/rawubaru.pdfIn PDF document text
    • http://helpcenter.business/9260609847692a8b.pdfIn PDF document text
    • http://genusttwsr.fun/46352657879emn3o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404753/normal_5ff232e9719c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5fcee8093dd6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5ff7090495fea.pdfIn PDF document text
    • http://becloud.website/what_happens_when_icloud_storage_is_fullg6yh1.pdfIn PDF document text
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/bf5ab197d2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391308/normal_6008d30c1e314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5fd26c206962a.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/7811168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_602eb0ee31e03.pdfIn PDF document text
    • http://exampl1214.com/honeywell_t4_pro_programmable_thermostat_manualxbn8w.pdfIn PDF document text
    • http://fastpysystem.online/12108153103m73na.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_600d6bc84f74a.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/figisuladilibu_xapibotef_vojifofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_6016671287f46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00034429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34429 4412 bytes
SHA-256: 3c6e871ef56fb48a20f57e0a40e5fdcded66564b278409311ebc5c53ab906781
font_01_sfnt_off000353c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x353C0 4604 bytes
SHA-256: e6629378dca8104fd93071ddf23d7ca47b39e575637e14d7605ce9f903a4d096
font_02_sfnt_off0003637a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3637A 10592 bytes
SHA-256: 46f000ba64ba081eb713699ce0184faaccc0f0499fcb542e19eb16401891c61b

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