Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21f9a7aaea2e10f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-08 15:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d41abdd7564b273b5d4f60cb3297f2be SHA-1: 0a427e0ea0790b2d26e9563354d589f65cbe76d9 SHA-256: c21f9a7aaea2e10f0599625699b66b9c32f89f9cbd8cab1b0fce18bc6cc79b19
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=aztec+pottery+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390383/normal_601454e894ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5ffa7c52eb90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_600a502b17213.pdfIn PDF document text
    • http://kofugefosuziwib.22web.org/pupejizajanudop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_602ae5ce938a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5ffff67673730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jetelusaxidu.epizy.com/94164546866.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/easy_video_player_wordpress_plugin_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/duduxitakoponijodafofegi.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/all_about_me_printable_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6b9d44-4cc9-4826-a274-d180df6bb338/wikedekemuzadubikifa.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_50f9e6f736834b34a21f484e44ed109c.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_eda3a33943204d5b8e87da4c7fe816b5.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_7d4695e088504be88eb8d2fc8a2c41c7.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_7dcd60bf0d6347acbcc1456fa566825d.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_e2f7a22c04cd45a8a934527847abd3a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e0d88e-e322-44ab-bf76-b2363c296b8a/tediliveparuxanozuveniviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5806375c-9cde-442a-a839-f62c28d2f9ce/resea_de_la_pelicula_el_mundo_de_sofia.pdfIn PDF document text
    • http://tavupovasar.rf.gd/banyan_tree_3d_model_free.pdfIn PDF document text
    • http://potolonufe.epizy.com/update_windows_10_version_1803_offline.pdfIn PDF document text
    • http://mulozeraxepe.epizy.com/30111442742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cf89a5-f317-425d-9527-7ffc972343cc/powugebigikasewepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0547df9d-db4a-4589-99b3-bc074a480126/ny_driver_licence_age_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd3ca4f-85d0-48c3-ba4b-152f10cfd9f0/8821002053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0847b01-fbd2-4e3d-9197-56f9df4ea718/brother_mfc-7860dw_wireless_setup_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/not_performing_well_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/98511714270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd880d6-f492-486b-b7a9-c45c63ebfa7d/judazuzopopoximeset.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_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 5148 bytes
SHA-256: 32ac6c510da7b7ae62aed8e0a5a6ff595c44112ab68be15c57dec8d27f90a8b2
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 10684 bytes
SHA-256: c10272ef822b2b19c479f3866e8e9040ae623575ea046223959a4edc273775f5