Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df874dd7b362f40…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 03:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1162cfc9197920d56654f26c2c406c4e SHA-1: a022230decb8d9312f1df03704ef7a31b7327bad SHA-256: 4df874dd7b362f40ba7399a60d6579eb54ef907fd49af9821370ed6caeeee386
76 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers as malicious. It contains an embedded URL and heuristics indicate it is designed as a social engineering attack (ClickFix) that instructs the user to execute a command. This suggests the PDF is a lure to download and execute a secondary payload, likely via a malicious script or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/award?keyword=cannot+edit+pdf+in+acrobat+pro+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388426/normal_603f30860799a.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/gj6XjaL/78404153495.pdfIn PDF document text
    • http://raruvutemogogog.iblogger.org/athlean_x_max_shred_workout.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5ff1cd9491b7d.pdfIn PDF document text
    • http://tezovawerufuger.iblogger.org/beduxubijawutote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_6000744d18437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60523581cbe9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601a807ca7a5d.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/fgfqvhM/lalos.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/xugigabitulu/supply_chain_management_trainee_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3ecb69-654c-4f81-b577-68c86da273d0/49726864684.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/sezebumomogim.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/70404675270.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/43729246305.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/97362175393.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/2017_8th_grade_history_staar_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/gisesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d6f559-d6ed-4303-b0fa-f803fa221556/oven_baked_smoked_ham_steak.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/83504814760.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/meeting_schedule_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/ap_chemistry_prep_significant_figures_worksheet_answers.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/artikel_akuntansi_syariah.pdfIn PDF document text
    • http://bifezuragumizi.rf.gd/how_to_install_honeywell_focuspro_5000_thermostat.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_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 5140 bytes
SHA-256: 813ce5a673762b65dc6c8dcf8cc61cb58800a2a83374584377a6ffb00a5ea89e
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 10592 bytes
SHA-256: 5c6b71b01cb3918a7b511d37d8ef7652f0f45d8c260ac355ed724c0587e24502

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