Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f38b9199bdf6792…

MALICIOUS

PDF

95.2 KB Created: 2021-03-16 09:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63e6fe3c3ccb25fb3c8c5c43cf4f952a SHA-1: 25cd0575f9547b1049832fecfbd13306ba545a4f SHA-256: 8f38b9199bdf67927c317788626e13e8ec5cf7f4eda4175af4b99f7a7cb23aa8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://vilenefex.ru/wix?keyword=gunz+the+duel+private+server+2018', is presented as a search result for game servers, suggesting a lure to a malicious site. ClamAV detection and ML classification further indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/wix?keyword=gunz+the+duel+private+server+2018
    • https://cdn-cms.f-static.net/uploads/4366652/normal_60499d7ed4aa4.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fd9584caddc0.pdf
    • https://cdn-cms.f-static.net/uploads/4447916/normal_600bba2d73df3.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_6016696dcf174.pdf
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fc69fa0b0e91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8452667-a464-4e36-9d00-7dc866fb343e/57390849563.pdf
    • https://s3.amazonaws.com/mutirexa/binomial_theorem_iit_jee_notes.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_f3cbc68607ce4966aa082b45af3b50dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2e284852-ffdd-46da-823e-48c9f54182e0/jaxokelapezezepiluvavepuj.pdf
    • https://uploads.strikinglycdn.com/files/62f80543-cef7-4035-8382-2cfab5c5caba/how_to_turn_off_touch_screen_on_acer_aspire_v5_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/005395bf-972f-430a-abfc-c71eeacd9e0e/org_chart_template_download_free.pdf
    • https://uploads.strikinglycdn.com/files/99e00f5f-acee-48ee-8386-caf7f6c152cc/cultural_historical_activity_theory_in_education.pdf
    • https://uploads.strikinglycdn.com/files/7e6569e8-bd80-42ec-8c8c-2e822f47743c/415195293.pdf
    • https://uploads.strikinglycdn.com/files/86b66ed5-89b7-4876-8c97-d64476f0dce3/39971052020.pdf
    • https://s3.amazonaws.com/farefasejikap/mubopebigowokuxiwojiw.pdf
    • https://uploads.strikinglycdn.com/files/c8c79d86-f78a-4bde-be00-21130e941e11/how_to_charge_citizen_eco_drive_watch.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_c5f0a25db57d425c8f0a9f1260054e73.pdf?index=true
    • http://loxometos.epizy.com/message_apk_iphone.pdf
    • https://uploads.strikinglycdn.com/files/6a6826b6-a7e8-4254-bd46-f6936c8599d2/mivudalebalutiregelufavaw.pdf
    • https://s3.amazonaws.com/divelatoxa/muputamoxulopijux.pdf
    • https://s3.amazonaws.com/kobivimelelo/28524039399.pdf
    • http://liruvumud.rf.gd/elapsed_time_worksheet_3rd_grade_free.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_off000127a7.bin
75d7b8f20c43268179e3b0c2366245bfb41f30e9b4a52c0d35c11ab955741fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 5708 bytes
font_01_sfnt_off00013b1a.bin
ee0c1546aa3d3180184b53f2aaa8696e43a2b9abe203aec1db3e8d2464ae7745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 2552 bytes
font_02_sfnt_off0001463c.bin
1634dad346910a8330dad803cda7d1d329136602eb55c4ff80502eca9ae97c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 11928 bytes

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