Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5b3dfad49074bf…

MALICIOUS

PDF

70.1 KB Created: 2021-02-22 22:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b9736ff97b31adadc872988e1338e6ec SHA-1: d943cd1ab6376cbab483f964623ff9e46f17f61a SHA-256: db5b3dfad49074bf261fba3d76a751aece45611251421ab218ca5ddcc369c8d0
104 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and a visual download button lure. The embedded URL, https://maypoin.ru/strik?utm_term=intellichlor+chlorine+generator+inspect+cell, is likely the primary distribution point for a malicious payload. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=intellichlor+chlorine+generator+inspect+cell PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5feea959a9675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_602c1db104981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5ff81f691b578.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/jdQOghg/31873171546.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/8hhhJgj/sandwich_maker_in_store_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/7gSg4hh/xovutuniredejejo.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hjahjcV/287165480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_600e135b81773.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/hgdOche/70705581775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fe716a99c3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_60182d8a33d98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ff355e97a58c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60187df7e05dc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 5132 bytes
SHA-256: 0e2809b4510bfe4b17964f44802f0d15826afafd5ba079cc4f8a290f5a996dbf
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10364 bytes
SHA-256: 1392178df2f088f39697feedbd5d67d56fb768437217d92ebf15530a732eb0c9

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