Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dbfcf1610e2ffc…

MALICIOUS

PDF

74.0 KB Created: 2021-02-22 14:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3792e2e7860bc9bb3db80778c249ee92 SHA-1: 8f7ec78bf5fdd9c3d5e6aee8c4af12c6232ec92f SHA-256: 84dbfcf1610e2ffc120ba9b164d628d41d9b00b84992ba058396a79cd7003244
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, masquerading as a document about communication techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/123?utm_term=effective+communication+techniques+for+couples
    • https://cdn-cms.f-static.net/uploads/4408871/normal_60182fd7932d6.pdf
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fcdc373ce900.pdf
    • https://static.s123-cdn-static.com/uploads/4375700/normal_600562e58c288.pdf
    • http://shoop-ft.ru/rawopililupevuli2msy.pdf
    • https://cdn-cms.f-static.net/uploads/4409246/normal_6015bc26d1de6.pdf
    • https://cdn-cms.f-static.net/uploads/4463298/normal_60132365a49fd.pdf
    • https://cdn-cms.f-static.net/uploads/4366042/normal_602df3f3b2c7e.pdf
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fd65757085b7.pdf
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5ffba89750ac6.pdf
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600f977a8a83d.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fd71403c0382.pdf
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5ff43a27e30fa.pdf
    • https://static.s123-cdn-static.com/uploads/4365636/normal_5ffcab12643d7.pdf
    • http://uplrezina.site/121287890395vcje.pdf
    • http://phtech.site/skinfood_everyday_facial_mask_sheet_review66sj6.pdf
    • https://cdn-cms.f-static.net/uploads/4371509/normal_6021bd7daebfc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e59b.bin
9258a3c83df640f99c3f7a625664276072914a44031bccc59cd599c332fcaf70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5396 bytes
font_01_sfnt_off0000f7e0.bin
b6717b9ccf316e4d471c09f1c584aa7f1cd9f0d554cf06b42d305e4afc3f445a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10116 bytes

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