Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c7aaffe7121708…

MALICIOUS

PDF

79.0 KB Created: 2021-01-10 16:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4552d3531452a517222f10a4889446f6 SHA-1: e488cea9c193bb8d32ee316505f91fc420f75f62 SHA-256: 85c7aaffe7121708ad9145a1692f552a5d1b4a72be1ef2e4fdd902356b6f117c
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and a heuristic for a visual download button suggests a phishing or social engineering attack aimed at tricking the user into downloading a secondary payload. The document body, though heavily obfuscated, contains references to 'shinchan cartoon movie mp4' and 'wkhtmltopdf', potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafficel.ru/aws?utm_term=shinchan+cartoon+movie++mp4 PDF link annotation
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/rideb.pdfIn PDF document text
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/dbec7af3d7078.pdfIn PDF document text
    • https://toxozuduz.weebly.com/uploads/1/3/5/2/135295771/3e443ebfef.pdfIn PDF document text
    • https://jevefelenop.weebly.com/uploads/1/3/0/7/130775498/122323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fd9cf088d89a.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/hayVlii/39436536748.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/Yjaqeii/lomokatomirekelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/penale/play_tamil_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/anemia_por_deficiencia_de_vitamina_b12_y_acido_folico.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jiriwarupufikopesez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 5004 bytes
SHA-256: 9750af6904ee30299029fa459abdbbbf07a90084ff07ff188bb97d52f294036c
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 11684 bytes
SHA-256: 2424a9ddc0e93582570285c4610dad03a69539c2fb09388bfba2b699ed1ba635
font_02_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 16336 bytes
SHA-256: 35ad8c2472189429d5cf46e08b7640bd909defb34b627552b7c49c3ad9b8cbaf
font_03_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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