Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bdeba49bb32cb8…

MALICIOUS

PDF

73.6 KB Created: 2021-02-14 06:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c10e421b5ff948f710a62246523e1063 SHA-1: 09152f2a9494ed9d8debe95aa51d096a5a67479b SHA-256: b4bdeba49bb32cb8e349728821003b48306c5ed953783dc055091c55f06d7718
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'seumenha.ru', which is likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'Nyc tlc forms'. No scripts were extracted, but the presence of external URIs and the nature of the detection indicate a phishing or malware distribution attempt.

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://seumenha.ru/123?utm_term=nyc+tlc+forms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5ff17d30a3258.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/NgeGB77/97455773209.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/8Ejhwku/rojemesaxurunosimi.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/djbhguC/moonpig_mothers_day_deals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fd676e9f2029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_600ac92f7c3df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fdd33d8f0a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_6021a6345544c.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hijgiha/3153694603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376869/normal_5fee09f36bb1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411937/normal_5ff62425ed6a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widiku/linaxaligebepefujizo.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/ekahau_rtls_controller_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/movafapadovikesegalodus.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/presente_simple_y_continuo_en_ingles.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 4888 bytes
SHA-256: 07b09125531f8638c4a3262d5dcbfced2b445af90f4453f1371cee51fe61f23f
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10672 bytes
SHA-256: 61f6c4085d01089d451110911fa6cae75372ba1f50eb98c522d05f7718491573
font_02_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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