Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5fde3d1eb168ff…

MALICIOUS

PDF

64.2 KB Created: 2021-04-12 22:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e8f1ec36c989145ee24545994ae84f94 SHA-1: 822fb28fab437303a63efdb324f2a43e9fac1ee0 SHA-256: 2e5fde3d1eb168ff2abc67fce15e7b877615a709643b300d5f2b04b7769c452b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or redirection attempt. The ML classifier also flagged this file with high confidence, supporting the malicious nature of the embedded links.

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
  • 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://dafemum.ru/strik?utm_term=behringer+inuke+nu4-6000+review In PDF document text
    • http://liketasi.22web.org/effects_of_bantu_education.pdfIn PDF document text
    • http://desokore.medianewsonline.com/how_to_use_salicylic_acid_for_psoriasis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_605f5c6fe1ee1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_600739e585257.pdfIn PDF document text
    • http://mutodute.22web.org/disuwesijupug.pdfIn PDF document text
    • http://vegavos.22web.org/sakipixupefetisutakuv.pdfIn PDF document text
    • http://difafaso.22web.org/understanding_multivariable_calculus_problems_solutions_and_tips.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/how_to_get_the_relationship_you_want_rori_raye.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cen_tech_battery_charger_fix.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/bayes_theorem_example.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/jaxekevawafasixuseniz.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/wetevali/bootstrap_form_border_style.pdfIn PDF document text
    • http://deneboj.rf.gd/55681683726.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_792f1b2f72c34b358601084a5fdfc14d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/how_to_change_door_latch_on_maytag_dishwasher.pdfIn PDF document text
    • https://711987c1-29b1-4778-951c-e0523d07177b.filesusr.com/ugd/4cd51e_f80b9043d96047508e0129e690eaa124.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voropa/living_things_worksheet.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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 5208 bytes
SHA-256: 2342828071f6e29ca274497b7296e8a31c7e525d59a8b24e35e3e33fead30fe5
font_01_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 9448 bytes
SHA-256: e65a42268bd3ac117ef7b6347d493071bf9fdaaeeb544d05a5ab28da15e54b05

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