Malicious PDF — malware analysis report

Static analysis result for SHA-256 d838e027da5e4000…

MALICIOUS

PDF

82.8 KB Created: 2021-03-18 03:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8637652d4bbf8bc5c806df5c6ea641c SHA-1: e3ccd44ff90d54ad64554d01c21b75c0873da451 SHA-256: d838e027da5e40006c792b93f6cc770dc66fb611d8ebb351255f213a2f38f857
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=aumentativos+y+diminutivos+pdf PDF link annotation
    • http://ruvenebigolusep.mywebcommunity.org/bhagavad_gita_in_tamil_chapter_18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420588/normal_60527f98aea5a.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/redufosemakexatikof.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/pavibuto.pdfIn PDF document text
    • https://zuwezulexexufup.weebly.com/uploads/1/3/4/5/134582503/godukipizakidifazu.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/early_christian_and_byzantine_art_john_lowden.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/773294994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fd680ce7511f.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/anger_iceberg_blank.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/vebifuzibekebodisa.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/mesaxibezejidepixakadode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6044db10e2b77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_602c5e06dad12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisetekotixob.myartsonline.com/how_to_redirect_subdomain_to_port.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/ventajas_del_aprendizaje_autonomo.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/how_to_reset_boss_gt_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576ef171-e511-4871-844b-05b18a353f26/noe_r.a_employee_training_and_development_7th_edition_2016_mcgraw_hill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6303d468-9f86-4fac-8ce5-64b35b74796d/tuxorov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef44c56f-8f17-40c4-85a4-941db8692e13/hayward_swimpure_plus_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78033e7a-41e0-43f0-ba27-4619bc4e767a/59356263716.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_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 5212 bytes
SHA-256: 6f5394794d469e516205e135480b33b7726a285ccd2c9a9f699f215e7312754a
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 12860 bytes
SHA-256: 57a63502f3d3da2758886ca43bbb4aebdb51d215c9f4f6f32ebc7073c50b8556

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