Malicious PDF — malware analysis report

Static analysis result for SHA-256 e259134ec9722f6c…

MALICIOUS

PDF

84.2 KB Created: 2021-05-22 19:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e5e0100043a302ca637c69b2993b6a SHA-1: 45ce96061abaacfe47f217e7ebd7b204ce24e872 SHA-256: e259134ec9722f6c2e2b5cbc4d43cc9190e1c0e652d1af5498a3571266757355
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on services like Weebly, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The embedded URLs and the heuristic firings strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=como+ativar+corel+x8+definitivo
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/tarumomibagi_biziwow.pdf
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/2614919.pdf
    • https://cdn-cms.f-static.net/uploads/4447093/normal_606a46f4794b7.pdf
    • https://judobujipukipaz.weebly.com/uploads/1/3/5/3/135300584/nejodobosovizat-jojugemeta.pdf
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/kopotikugalu.pdf
    • https://zumikefu.weebly.com/uploads/1/3/4/8/134886628/gejatusega-danat.pdf
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/raragokod-menixuka.pdf
    • https://cdn-cms.f-static.net/uploads/4494430/normal_604635de1c2c4.pdf
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/92e1b648260.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e9e58554-bb83-4060-9045-568c8a1d80b4/91375655026.pdf
    • https://uploads.strikinglycdn.com/files/23a8a425-90f5-4587-8fa5-4d6ecb0ba1f2/what_does_angel_message_808_mean.pdf
    • https://uploads.strikinglycdn.com/files/952a034f-acee-464f-aaef-1b60ed557bf9/gumododixiduweleben.pdf
    • https://uploads.strikinglycdn.com/files/29ffcbc6-54af-4aa7-95df-6fe231c98235/49857627213.pdf
    • https://uploads.strikinglycdn.com/files/ac39da6c-4996-44dd-94ab-5bf15b6d4db9/japilivaratufuvatanulafi.pdf
    • https://uploads.strikinglycdn.com/files/6896f58d-94b6-4b2a-b6e8-0188e0dd505f/what_is_magna_carta_simple.pdf
    • https://uploads.strikinglycdn.com/files/d998528c-2274-4d9b-bacc-03565823ef4b/vupipuwuzidobiribitijupe.pdf
    • https://uploads.strikinglycdn.com/files/220957e6-c8cf-457c-8ea4-0fffa9aae783/casio_telememo_30_world_time_3_alarm_manual.pdf
    • https://uploads.strikinglycdn.com/files/feceb8c5-78be-436e-9393-2c0f435df3ab/active_listening_skills_teacher.pdf
    • https://uploads.strikinglycdn.com/files/ce938c1f-ed1b-4657-9da2-2b61c5008cae/what_is_the_best_model_keurig_to_buy.pdf
    • https://uploads.strikinglycdn.com/files/1a394193-4f48-4d14-bd85-ae588814b1b4/how_to_cook_rainbow_trout_fillets.pdf
    • https://uploads.strikinglycdn.com/files/67ab5bc0-7c3c-4fe8-8711-d1208c9203a4/87246131430.pdf
    • https://uploads.strikinglycdn.com/files/2ab4243e-277d-47c4-9cbf-4a74c8a150ac/does_it_cost_to_play_fantasy_football.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_off0000ec41.bin
1d26ec95d245e31690a79cfc43b58b4e49463c9791349addc71199fb8c112571		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 4132 bytes
font_01_sfnt_off0000fae2.bin
d7e02e3d8147080dcc9907d364291c943fd1230a25422eefe3a7324707caa6f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 5216 bytes
font_02_sfnt_off00010c8e.bin
182b2c5d083ecda2023af11486fed8e1f6cfc8b86c7a6533fea1c4a8c987b46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 19184 bytes

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