Malicious PDF — malware analysis report

Static analysis result for SHA-256 102b7d64ecf7fc49…

MALICIOUS

PDF

70.0 KB Created: 2021-03-17 15:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e492911538d77a93419448645ea2ec5f SHA-1: bf843d913ee544c449d26a94de14d5d3d29d938d SHA-256: 102b7d64ecf7fc492c1d78a6d723e8dc06c3321d286e8193f9c163c6f9ce3fbf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to attract traffic. The primary URL, 'https://jottigo.ru/wix?keyword=download+cartoon+photo+editor+pro+apk', indicates a lure related to downloading software. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=download+cartoon+photo+editor+pro+apk
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/7238663.pdf
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/5084491.pdf
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff0042fe1f5a.pdf
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/mixetevifi_jatigozokuvufen_sojedaga.pdf
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fe8e9b1cd912.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_5a4d31111fc84af9bb74188f7b738760.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_6d906af499914a31a79062d8c7042021.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_2acaab5ce1e84ce7b9a51434093d8599.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_eef84f6efe694649bb6baf3ba8aafd57.pdf?index=true
    • https://s3.amazonaws.com/nisoxow/rexiwuxefizifefuke.pdf
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_2473e0d2aa984ba6b01ba29e2ec23a11.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_d16d509fbd7541cdbdfd73efec3cd91d.pdf?index=true
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_80f427eb62ba4c2ab5ca0d05c89e74df.pdf?index=true
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_d347c38568b54f9b9bc4b9b063978cc7.pdf?index=true
    • https://s3.amazonaws.com/libowebujakux/amazon_india_latest_app_apk.pdf
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_8f4c67e7796e409a90406b471de2cf51.pdf?index=true
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_0cf9cd522038413fb8b800d7b819fd13.pdf?index=true
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_b7b7741ac28c4a89b6e54e1bd99d1fb4.pdf?index=true
    • 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_off0000d359.bin
f9ecaae0e962981f8db9f40ef19b3d65fefa2e3b75487c55f178823ce7e83bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 5136 bytes
font_01_sfnt_off0000e4e8.bin
64d76f268d2d4194c039a8c4a0170afbbe7a76910dc40acfcc0ab4f2097fbf2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 11100 bytes

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