Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da3c2129f6bd81b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 01:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f63f774a09758a22efef00f36b3bfd4f SHA-1: ef84815ce83e210070b04501c0b74b7e3b3618cb SHA-256: 1da3c2129f6bd81b305b719eb1c2562a0d1baf8dd47c1b9180e67b7e143094bc
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'Cereal crop diseases pdf' and the authoring application is wkhtmltopdf, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://druttle.ru/award?keyword=cereal+crop+diseases+pdf PDF link annotation
    • http://xuwamamesatopa.22web.org/sleep_revolution_arianna_huffington.pdfIn PDF document text
    • https://fumitosebajogo.weebly.com/uploads/1/3/0/7/130740118/f9ced1758a.pdfIn PDF document text
    • http://goldstein.capital/6556057972004a7k.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/3566086.pdfIn PDF document text
    • http://usesalle.xyz/learning_and_memory_from_brain_to_behavior_4th_editionnwj9o.pdfIn PDF document text
    • http://mylic.ru/it_hr_interview_questions_and_answers_for_experienced_candidatesqgwrr.pdfIn PDF document text
    • https://timowerudep.weebly.com/uploads/1/3/0/7/130738780/3800784.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/noditasurapobekebenoboma.pdfIn PDF document text
    • http://jobware.pro/fishdom_online_unblockedi3akv.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/tudefu.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/410194.pdfIn PDF document text
    • http://iuts.space/79310822394c0na1.pdfIn PDF document text
    • http://tersq.space/revising_and_editing_practice_3rd_gradef5dc8.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/tirimexetowetut-ruluzutir-wekukirumeje-nofezosur.pdfIn PDF document text
    • https://jofevuwob.weebly.com/uploads/1/3/4/2/134235005/1134756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/068da329-15e1-41fc-be0f-7c04eb2d65b0/machine_learning_using_logistic_regression_in_python_with_code.pdfIn PDF document text
    • http://nuloporime.rf.gd/fundamental_accounting_principles_larson_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa352b0b-cd87-445c-810f-d730dbacdf6e/rufab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d5d72c-85a2-44ec-9513-f8aea555e82c/lipatezu.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/cms_template_wordpress_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecfe511-ac27-48fd-b3f7-ed4800d18fe5/how_to_change_profile_pic_on_iphone_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2dda75d-fca2-411e-a5fa-56243c7e8b75/26837195122.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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5052 bytes
SHA-256: 9b545fcdc580d1320ef3aa3bf14e3ece6a6fc4443381820aee5749f16ba87613
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10804 bytes
SHA-256: ee0d45c82d088d779a22e0f3d72e8a0f29c50acd68edd70bd52d3cadf34a93ea

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