Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4174bba0f024d92…

MALICIOUS

PDF

112.9 KB Created: 2021-03-16 23:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d13284bc6a8e730b180ba0115b7b8fc7 SHA-1: 6ba92ac43bdf852cbaaccdcdd6acb12f2abb69dc SHA-256: c4174bba0f024d927fbc6296b8b8b117a86c3a64fb94f202a3423808243bc8d2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a game, 'Ring of the grasping grave', which is likely a pretext to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=ring+of+the+grasping+grave PDF link annotation
    • http://rupazaduxil.mywebcommunity.org/75969515996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454679/normal_5ff02a58663db.pdfIn PDF document text
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/ranet.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/KHghKha/guide_for_fall_guys_game_ultimate_knockout_full.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/blood_angels_codex_supplement.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc93a3534b67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ff3cc64f12cf.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/oracle_sql_get_date_with_timezone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_60346309cfa13.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/6d5f0239a439655.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/most_popular_game_companies_in_the_world.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5ffe075195b28.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/1206448.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/cVfgis0/n64_emulator_apk_with_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_602fb070606a8.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/sentimental_journey_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_603e3563e2b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_601a548c5356e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizexazebubo.atwebpages.com/better_than_before_synonym.pdfIn PDF document text
    • http://pizenusogusu.atwebpages.com/10_new_syllabus_tamil_guide_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB7 5200 bytes
SHA-256: c6dff44eca7adfbce1b9f2baa85a308c6663bbb2e6c17941cb2d8787be66bb53
font_01_sfnt_off00019178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19178 10816 bytes
SHA-256: c671ce2e330350b39f365f958dad484987265ccf4287cffdb7bdc1813e2cc233

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