Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e90d9c905fd3773…

MALICIOUS

PDF

94.0 KB Created: 2021-02-15 04:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d886a239bc4a8f4b69a5ba8ef422647 SHA-1: f95ebeb52374d94e965b9875abd64536563d68b5 SHA-256: 5e90d9c905fd377316808d44946e000c08f416abe7e86b59e8cf1f1a9593b747
136 Risk Score

Malware Insights

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

The PDF contains multiple invisible links, two of which are specifically flagged as leading to a CAPTCHA-themed lure. One of these links points to 'http://zuxulabawiba.rf.gd/captcha_code_full_form.pdf', suggesting an attempt to trick users into believing they need to solve a CAPTCHA. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://druttle.ru/wix?keyword=h+words+for+kids PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/Ep1rhaB/28880354541.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/Yhdhfgi/faxezoxojukesoluwol.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/OEuMibE/kpop_popular_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/rigeje9/tiktok_video_editor_chinese_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xagevudogitoti.epizy.com/33222431164.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/yantam_marathi_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/blender_rendering_tutorial.pdfIn PDF document text
    • http://padekapekalerel.rf.gd/free_printable_comprehension_worksheets_year_6.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/jewelers_mutual_insurance_company_annual_report.pdfIn PDF document text
    • http://zuxulabawiba.rf.gd/captcha_code_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/vezovujefedilinaxativoram.pdfIn PDF document text
    • http://nopatiget.epizy.com/algebraic_fractions_worksheets_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/formation_en_alternance_traduit_en_anglais.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/nejefutadigu.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/escape_room_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/28769148365.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 21088 bytes
SHA-256: 722b76fc00f14d76c7dd3bf892ba0a9da6ce8312a67e471b32e507c16daa0e4e
font_01_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 4776 bytes
SHA-256: 9e87caa67220065d13f96a77f3034ffa77a39bf442cccaf1c12b714199c044f1
font_02_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 14120 bytes
SHA-256: 1157ac0d4db5a96dbe91354a4148a85383695577dbcd06d6050783c9ea7188ad

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