Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f21d50f6e2d0f3…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 01:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5239150a7c75dce3570a60721352b25c SHA-1: 76deb0ca56c40e8ee914d751019f4a362085af9a SHA-256: f8f21d50f6e2d0f3d97803d9835a2b78b909aa0eb2b842e93cb49cd8eefc56da
96 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs, one of which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'bombastic words with meaning pdf', directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://botokaw.ru/award?keyword=bombastic+words+with+meaning+pdf
    • https://cdn-cms.f-static.net/uploads/4453563/normal_60663b3b1c7a2.pdf
    • http://xinuvaro.sportsontheweb.net/american_assassin_books_in_chronological_order.pdf
    • https://cdn-cms.f-static.net/uploads/4385028/normal_60664915ebd37.pdf
    • https://cdn-cms.f-static.net/uploads/4454808/normal_5fe6862a7c38e.pdf
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/5207510.pdf
    • https://zimavilagapiwe.weebly.com/uploads/1/3/2/7/132712623/tovovurejona-nilajuret-bisilojivitas.pdf
    • http://belofakomag.mywebcommunity.org/fijixaf.pdf
    • https://cdn-cms.f-static.net/uploads/4408593/normal_602506908d17b.pdf
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/rugepuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dugubokig.rf.gd/chargesheet_online_maharashtra.pdf
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_509395a24d6049c29b630acb94fc2931.pdf?index=true
    • https://s3.amazonaws.com/tuxexi/dungeon_master_s_guide_5e_online.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_d51b65c8e7ef4835ad4dc76318bb969f.pdf?index=true
    • http://dimaninerif.rf.gd/penatoworekiw.pdf
    • http://fezefujeziged.epizy.com/fazatenusezaninevilez.pdf
    • http://jugofave.rf.gd/dubejikawewomawoketu.pdf
    • https://s3.amazonaws.com/palikuvexake/13888034800.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_3f74a58a6f674511944b42d2a851d7d1.pdf?index=true
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_9ea0ce1c00f048e0b570cc6f1d24139b.pdf?index=true
    • https://s3.amazonaws.com/ropuba/how_to_start_a_music_video_production_business.pdf
    • https://s3.amazonaws.com/pajeriramal/battle_net_launcher_mac.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_off0000f13f.bin
7b4b7269e6f7945d87c9d091cc0282d4dbdbd141a917896628b6c5659b5d80f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 5820 bytes
font_01_sfnt_off000104f5.bin
897ce79dfbe3ae56061942874344d92ed91cc1adc3905e16781246c94b193112
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 10432 bytes