Malicious PDF — malware analysis report

Static analysis result for SHA-256 472b965c04b216a2…

MALICIOUS

PDF

107.7 KB Created: 2021-03-27 12:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78b3fc71c21dc473f16bd22727859c38 SHA-1: d221269ca6e4f8d5d088253e3db128895ed50bb4 SHA-256: 472b965c04b216a28df2733b422321745d4499b32e0be9e043b635905f0d11fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or spamming operation. The primary URL, https://seumenha.ru/award?keyword=designing+classroom+language+tests+pdf, is likely part of this scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to drive traffic or potentially deliver further payloads.

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://seumenha.ru/award?keyword=designing+classroom+language+tests+pdf
    • https://cdn.sqhk.co/rebamomidaw/gh6YO6i/xugovujuburidemoted.pdf
    • https://cdn.sqhk.co/zizunujozazi/g3hisjf/16956959863.pdf
    • https://static.s123-cdn-static.com/uploads/4492281/normal_5ffc284d68ee9.pdf
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5ffcd8c6a973d.pdf
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/86f5caedd31.pdf
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/fulorew.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6058f8d2b041e.pdf
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5ff01ec7ce133.pdf
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/351e683281b838b.pdf
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/pozus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e1540b4-a762-417b-80dc-a1293bc04d0c/how_to_print_all_documents_in_foxit_reader.pdf
    • https://uploads.strikinglycdn.com/files/be76c9c7-01c9-4790-bebd-6c35a86f6c78/waterpik_water_flosser_costco.ca.pdf
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_74de24378d2146378bc89a0416f4ca63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90a8e22f-68fd-4d82-b5aa-f9e0eebe4605/zexowikositujibe.pdf
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_e27ee67458f54702ba704419fbbb7438.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d98900b-4497-48d6-9a49-35637d80410c/warogugudasi.pdf
    • https://uploads.strikinglycdn.com/files/34b692b7-49ab-4cb0-82f5-218588c00a5f/how_to_use_a_cool_mist_humidifier_for_a_baby.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_abdb6140e06a483fbe142f0d8e45e2f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a10696a5-c96a-4f03-bd0a-cc0916a23567/best_record_storage_boxes.pdf
    • https://uploads.strikinglycdn.com/files/92ce1ad5-d886-48c5-b5aa-3a9a3aa81c11/is_toto_washlet_sanitary.pdf
    • https://uploads.strikinglycdn.com/files/e9e673ef-c056-4427-b3a6-02332492f58e/fender_mustang_3_user_review.pdf
    • 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_off000165f1.bin
45fd764a5ccf5a914297a97a9687693b463594370b6852d6ed83548ac6874a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165F1 5476 bytes
font_01_sfnt_off00017883.bin
5e43a2c8aea539950dd73d0f6893f241075fc63557b025a4e11996f75d58089f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17883 11508 bytes

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