Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e437bb919d2c73d…

MALICIOUS

PDF

214.3 KB Created: 2021-05-19 07:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 01e818d1d56ff7b57ea316ded9f28ff5 SHA-1: 2d46a19a9410de30581976ee924dcb75927059d7 SHA-256: 4e437bb919d2c73d5ea32bbf9e565f9e8e28a83b1382b771f0704f6f89366b8a
136 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it's a remote support tool lure, a common social engineering tactic. The embedded URL points to a suspicious domain, likely used to host or redirect to a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation and potential execution of further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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://nipisod.ru/strik?utm_term=is+port+443+udp+or+tcp PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/03baae30-cc91-46ac-b460-ddd8f1aad812/vabusenolijer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ad6377-0569-4d38-a6b4-6dcc424def28/types_of_history_of_education_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/gomutowebozejokuno.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/ipad_mini_5_wifi_5th_gen_64gb.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/border_radius_input_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f77373-6285-48cf-813d-d9824b7d3fe6/herramientas_de_monitoreo_de_red_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/46840280120.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/74195622122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84383816-f694-445c-a0f7-b93f3e66474c/what_stimulates_black_hair_growth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8170ac70-0b6a-4d76-b844-913d0c7a642b/nejuvubog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f13807e-ef9d-4d5a-8bd9-a5164d9f7435/how_to_fix_kenmore_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/95311258552.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/abriendo_paso_gramatica_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/music_aaron_smith_dancin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690a7104-950a-40ab-a285-fd70ce926bf9/how_to_solve_enthalpy_change_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb76be1-42bb-473a-adf0-9637a0daed46/40534990445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a47f034-763c-44f4-a05e-fcc962177eae/zuxojiramogugenafug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4279991-7c91-4470-86ab-fa94412a0c6b/kulunawadugipajotogesamer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED38 4624 bytes
SHA-256: 8b24762c43ddb450402d65c56395d6d57918f6a66ef168d1b9488a0920dc0a61
font_01_sfnt_off0002fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCFD 12648 bytes
SHA-256: 2fa80c802bda07747c9a526637baff9278372d0974f030745eee93a7d0fce3d6
font_02_sfnt_off00032724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32724 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off00033c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C52 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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