Malicious PDF — malware analysis report

Static analysis result for SHA-256 833511c57b22ce64…

MALICIOUS

PDF

75.3 KB Created: 2021-04-02 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94b719c9e198cd62e4a442509ef2330c SHA-1: e14e2036d362ed800f15d7070dab32c434975c26 SHA-256: 833511c57b22ce64290a6a85f8793fc049c17aa1afbbba55fafb094181c98a39
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by a machine learning classifier and ClamAV, and it contains heuristics indicating a remote support tool lure. The document body, though heavily obfuscated, appears to reference a 'Kali linux installation guide pdf', likely a pretext to trick the user into downloading a malicious payload from one of the embedded URLs. The presence of external URIs suggests the document is designed to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://bologen.ru/123?utm_term=kali+linux+installation+guide+pdf
    • http://frukt.fun/ragenajefq8ffe.pdf
    • http://lakcherie.ru/how_to_turn_off_demo_mode_on_panasonic_inverter_microwaveggbgp.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn.sqhk.co/kubasovusi/jeFghfw/50354401298.pdf
    • http://viwimewi.22web.org/zebovufijomomuzunimi.pdf
    • https://cdn.sqhk.co/jaziwuke/haSFKid/wipenobupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f25bf2ec-067c-4208-9ad9-2a017940f004/tableau_desktop_10.4_download_free_full_version.pdf
    • https://s3.amazonaws.com/fajeloninesitel/4665272071.pdf
    • https://uploads.strikinglycdn.com/files/983a617b-03ac-4e9f-8f67-5a04ece0ead9/super_mario_land_gameboy_level_4_3d.pdf
    • https://s3.amazonaws.com/norozovijalu/44006170046.pdf
    • https://uploads.strikinglycdn.com/files/9e4b2ae3-80cf-45e7-a4fa-686d3622d80e/65719757358.pdf
    • https://s3.amazonaws.com/lomiwexuva/29670658209.pdf
    • https://s3.amazonaws.com/lemefofutomapox/thyroid_cancer_ppt.pdf
    • http://vosanaketole.rf.gd/imagenomic_portraiture_2_license_key_free.pdf
    • https://uploads.strikinglycdn.com/files/e9ead01e-86c4-4bfa-a069-8297520159d7/hikvision_error_code_153.pdf
    • https://uploads.strikinglycdn.com/files/d3bbcab7-ede5-447f-81a8-18d4cba8327a/can_i_become_an_emt_in_high_school.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/combine_excel_spreadsheets_into_one_spreadsheet.pdf
    • https://s3.amazonaws.com/popilo/watch_live_tv_channels_online_free.pdf
    • https://s3.amazonaws.com/lonozote/92787793181.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_off0000e900.bin
5126ddd903e0c6eb75e52ef0b9b63eb5940a7a5650205de31ce5c8cf15dd5e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5152 bytes
font_01_sfnt_off0000faa8.bin
0d5b32a0640634307c1cd1741768f16b0802f7aacfcd67123a7a6197c806f9cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 11052 bytes

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