Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef1c1164b411a3a…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 15:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eadbbb391af1e8e52d085fbdb7b688d5 SHA-1: 2b3c50739a1bf7977e2a6ac47587ca09f44bab77 SHA-256: 0ef1c1164b411a3abdf8b0979534e90dd15f1c124e76b161f001f832bf08ebb7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting or known redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a lure to malicious sites, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=dpip+photosynthesis+lab+answers In PDF document text
    • http://vewazovowev.iblogger.org/bartter_syndrome_review.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/towojujigurilerowe.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/monolithic_kernel_vs_microkernel.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/construction_company_profile_design.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/52434226362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5ff23bc7c66e6.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/bohemian_rhapsody_guitar_solo.pdfIn PDF document text
    • http://reactivascotia2020.com/how_many_months_do_you_need_to_study_for_cfa_level_1tukqg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fcd7c25259be.pdfIn PDF document text
    • https://levusukep.weebly.com/uploads/1/3/0/8/130814129/8265939.pdfIn PDF document text
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/4734138e35c3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merapenerabari.myartsonline.com/lerowepuvoveludexinufom.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/revenue_canada_forms_t2125.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/emulator_game_ps2_di_android.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/jetblue_flight_292_report.pdfIn PDF document text
    • http://zewedazogiwake.rf.gd/mandatory_reporting_training_modules.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/23415034121.pdfIn PDF document text
    • http://jebebubijegew.rf.gd/89595294622.pdfIn PDF document text
    • http://paluluw.epizy.com/electric_field_problems_and_solutions.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_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 5240 bytes
SHA-256: d48efd34f764883951b2b523a54f5c2e8b535538e7e0c514ce53a59a95224090
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10400 bytes
SHA-256: 26a373f3f8815baaa9826f528b15c10eadb65ae662afcab35ece04532c4c48f3

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