Malicious PDF — malware analysis report

Static analysis result for SHA-256 8699195120afce81…

MALICIOUS

PDF

79.5 KB Created: 2021-04-01 20:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74c37417bd4c57d7ccba7d8e9f3f80b7 SHA-1: d7782d1cb836c94293d3edba765d0f24f807321f SHA-256: 8699195120afce8181ee2f2c90b63592cea62aeb3282d081503cb1b498dbd8d7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent, possibly to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=watercolor+techniques+for+beginners+pdf
    • http://vataponuxizeliz.mywebcommunity.org/nationalism_and_patriotism_of_filipino.pdf
    • http://onenature.space/contract_killer_2_mod_apk_data_offlinej744p.pdf
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/b3d8d61.pdf
    • https://migaxodilex.weebly.com/uploads/1/3/4/8/134852634/9d02455b0bdcd10.pdf
    • http://osmosiotzs.fun/4495504774e2t8a.pdf
    • http://penafur.scienceontheweb.net/2005_yamaha_v_star_1100_maintenance_schedule.pdf
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/diziresujobugugo.pdf
    • http://vuwefedope.sportsontheweb.net/zoturarativo.pdf
    • http://rofogukiluvupu.mygamesonline.org/mathematical_analysis_a_straightforward_approach_binmore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a96c5afe-2e14-4c81-9923-980facf6098c/james_bangla_band_mp3_song_download.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_0edeec3e9d0043548f0e7f264f86ac59.pdf?index=true
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_52ecd7a3bfa14321a1e8db45c1c99dd1.pdf?index=true
    • https://ba5d4ca7-777b-4ff7-855d-60fc8da7b8b2.filesusr.com/ugd/29a726_c81e58dfdb4f4323a02350e69ddda72d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a121a5f4-5fb2-47fe-a91b-85013c770d12/sharepoint_tutorial_for_beginners_step_by_step.pdf
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_2d9bd9b19779443088cc93cc9591e429.pdf?index=true
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_e4948fb7a7664b6e998a76bfbdd26a27.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_192f59843f9a4300bccbfdf35a00d091.pdf?index=true
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_480b8968c388472ab7739ea6bfd75510.pdf?index=true
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_7b661dd285ce4b05bc36f7ff484b2968.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20746354-426e-4a83-a4b3-5548433d5904/cronicas_de_una_muerte_anunciada_resumen_corto.pdf
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_f6866cb9db654572a592b4425b513fb1.pdf?index=true
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_5447b91838654e049e746fed5b753a0b.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_off0000f64b.bin
8b37a51a8676fb6fea499364866245771eae84422022ae43e7eac5f0afd3ae66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5696 bytes
font_01_sfnt_off000109a2.bin
0f9c4560884a2bb17a6d8205186a3a11593aa08006a6eec402e73aab2693e2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 10912 bytes

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