Malicious PDF — malware analysis report

Static analysis result for SHA-256 298547bb0b43099b…

MALICIOUS

PDF

80.2 KB Created: 2021-02-28 03:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9450b685abc58b9d5e361ab3b102946 SHA-1: 66b6b48e7b3f14936982a2b857e4dd6d6ff376bc SHA-256: 298547bb0b43099b54aab73c99b942b2770d77c1967c3493b61bedc38324f7b5
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, vilenefex.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to a quiz, which serves as a lure to direct users to the malicious URL. No scripts were extracted, but the presence of external URIs and the high confidence malicious verdict suggest it's designed to lead users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=parallel+structure+quiz+with+answers PDF link annotation
    • https://cdn.sqhk.co/sarowojep/YbFer16/battlefield_royale_the_one_hack.pdfIn PDF document text
    • http://jumbochecker.com/learn_excel_macroslfkt4.pdfIn PDF document text
    • http://lenudes.com/belanger_shower_faucet_manual920da.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/e6Ijfia/65534285069.pdfIn PDF document text
    • http://edarudost.online/wodamurefapizinetiticp3rp.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/4hcgdjg/62348004421.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/gjgvSjh/sonic_boom_rise_of_lyric_wii_u_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/9gcJhbW/world_chef_game_hack_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/iqrvTji/22882617771.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/8ShdxAm/cookie_clicker_2_hack_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/cjaNEnY/audio_pro_addon_c3_vs_sonos_one.pdfIn PDF document text
    • http://vereffka.xyz/assistant_jobs_nycmzxwz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/19332219638.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/new_jersey_municipal_court_docket_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/lagu_hanya_rindu_andmesh_kamaleng_stafaband.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5156 bytes
SHA-256: 56c4d0434faa17b22e4348d4bd1208660fcfd3d3e68edf5a7ee0d0f1c9f82a5a
font_01_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 2484 bytes
SHA-256: 8085e85f7ab2ec424f2d1e8603e5adaf13eeac0702cda241d6a7218dd8b8c71c
font_02_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10280 bytes
SHA-256: 4e97aed3c447a27580c893e2faaef4842278dd024e0e39af79591ae69597e31f

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