Malicious PDF — malware analysis report

Static analysis result for SHA-256 5475d255097d37c1…

MALICIOUS

PDF

74.8 KB Created: 2021-02-15 03:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a33f298d13670cd7de76b186e61a9599 SHA-1: 864e5cc79c7e43a874a9320dc435e07e524d14e8 SHA-256: 5475d255097d37c190c8ab3b232769a418f3ed882184b1a73c893008e4549639
114 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is flagged by heuristics, indicating an attempt to lead the user to a harmful site. The document body and heuristics suggest a callback phishing or tech-support scam pattern, aiming to trick users into clicking the link. While no scripts were directly extracted, the nature of the redirector and the ML classifier's high confidence suggest a malicious intent to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/aws?utm_term=disable+qualcomm+secure+boot+android In PDF document text
    • http://vejofewi.iblogger.org/bomb_squad_mod_apk_unlocked.pdfIn PDF document text
    • http://wejnpowk.space/gadgil_report_summary_in_malayalamsif91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fceb0370e8b1.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/sajatofubote/banomoti.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/49870439558.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/13392987647.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/mamomemisujiji.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/balearia_denia_formentera_un_dia.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/physics_grade_12_textbook_answers.pdfIn PDF document text
    • http://zufonokimilije.epizy.com/mphasis_pune_aptitude_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/internet_manager_google_chrome_extension_file.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/seluxetumowotulusakamola.pdfIn PDF document text
    • http://pifutujotot.epizy.com/work_time_management_template.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 5348 bytes
SHA-256: 6d9eebcf968c2ca1859102486bd2c87e80b517745cc18279336f11dafa6abea2
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11284 bytes
SHA-256: ac3013239b617e7f98d3587de9073f82e7fb58d92da013148128aae9186f2d4d

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