Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b022cbb68621f3…

MALICIOUS

PDF

72.7 KB Created: 2021-02-16 22:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: ebecd1ed90f497e6d5ad8a16d2814d60 SHA-1: cf7e69fc32d987d7f76ec8e3738132f5fead15fe SHA-256: 99b022cbb68621f32266c834ca90a16bb49b1c2628b3b6d789f73771861ae7a9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=ab+ripper+x+worksheet PDF link annotation
    • http://tovelksa.website/jikefemerokafexupzhci.pdfIn PDF document text
    • http://jonezuno.22web.org/audacity_software_for_pc.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/91375.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/DidCugd/machine_learning_cnc.pdfIn PDF document text
    • http://khanapoorti.com/angular_5_dynamic_template_variable_name7qmoq.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/gkNgihK/rigovepepakofedare.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/2WGx43M/square_boy_pizza_brighton_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/jhggha4/watercolor_circle_art_projects.pdfIn PDF document text
    • http://toramomegigex.22web.org/bhojpuri_video_dj_song.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/lenuvokebok-nigeze.pdfIn PDF document text
    • http://pumba-timon.space/4671323227mth5h.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/vobuturinivi/64636754085.pdfIn PDF document text
    • http://fojamemu.epizy.com/bibimosolipu.pdfIn PDF document text
    • http://gujodupilewibo.epizy.com/98195747676.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/resident_evil_biohazard_ps4_trophy_guide.pdfIn PDF document text
    • http://pejulok.epizy.com/cissp_study_guide_eric_conrad_latest_edition.pdfIn PDF document text
    • http://nezenomawaza.epizy.com/what_nutrition_facts_label_tell_you_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/duragal_steel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/4175384156.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/26873685544.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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 5020 bytes
SHA-256: 8261c09cf02890da22e1dcdda680ea7ee9d317b4389641d1dd2a008aeb85973d
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 9884 bytes
SHA-256: 4d15276edaebc89ad6e159949b22b4bb0adb8dcf2b92d0f78662980373290aaf

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