Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c3e9b0abd1dc75…

MALICIOUS

PDF

81.4 KB Created: 2021-04-03 14:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132ac24cc867fb8313e65acacd76adf2 SHA-1: 971cf2c3b22b0ae8ef9df8b8c3f1e9131183bd23 SHA-256: a6c3e9b0abd1dc75cb90e82029cbff9317a1e786b75776661e176bde8a8c2cd5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being 'https://seumenha.ru/aws?utm_term=what+to+read+for+sat'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

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-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/aws?utm_term=what+to+read+for+sat
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/wobulijezaja.pdf
    • http://silewugebed.scienceontheweb.net/moors_and_masonry.pdf
    • http://zujejilolo.scienceontheweb.net/card_games_rules.pdf
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/dilegijuk.pdf
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/a6610e.pdf
    • https://kagexafezadasu.weebly.com/uploads/1/3/4/3/134318935/09218ad03a.pdf
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/8164299.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/1665755.pdf
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/getebelo_pigekatugimu_lepezuwizile_vigiwapu.pdf
    • http://tevutubiwij.getenjoyment.net/fivoxab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a743e30d-83c7-4623-a89a-63e92f9c7f5d/31738656431.pdf
    • https://uploads.strikinglycdn.com/files/90932743-0a71-4d43-acb0-c23dc861f951/yoga_exercises_for_lower_back_pain_youtube.pdf
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_eb75cc6cb37a49108fedbafb0e16f2b6.pdf?index=true
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_6a916ea46552486f8853bb8b79c824bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1482eb5b-ce4e-4b27-8ec0-e50a5fb6e765/how_to_build_android_app_using_python.pdf
    • https://uploads.strikinglycdn.com/files/760015d7-3b05-491e-99ad-c21d984a646a/the_reluctant_fundamentalist_quotes.pdf
    • https://uploads.strikinglycdn.com/files/6685b220-a379-40eb-9a1f-6a1424cd38ea/20520288541.pdf
    • https://uploads.strikinglycdn.com/files/7bd0b415-96b5-4b6a-b99c-47c109bd592f/2011_hyundai_sonata_front_bumper_replacement_cost.pdf
    • https://uploads.strikinglycdn.com/files/6aac0ae6-6aa6-49dd-b2a7-8e3226dc0db4/discuss_the_preamble_of_the_constitution.pdf
    • https://uploads.strikinglycdn.com/files/caa91927-bfd2-402e-9703-92eab25c9bd2/zijoro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f754.bin
544965ff1542c59a9335dbeafaf80bfb0997ec76a9ee9e5f843b21a1d63b8222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 4612 bytes
font_01_sfnt_off0001071b.bin
0a0d553c52f4379fe2cdf3e62601ea44cf58dae638f4e478b7136c2426f5aa61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10316 bytes
font_02_sfnt_off00012a3c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 4324 bytes

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