Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5b4bd783775f7b…

MALICIOUS

PDF

64.8 KB Created: 2021-04-12 20:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6780771581496bdcda051ba3a2e27bc SHA-1: 4c26d8bcc9253d702fb63540a3408e70062ed2d4 SHA-256: ea5b4bd783775f7bff18e78e22e0541d6c04923e3426abd4d1fabbaf9a02ace9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

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
  • 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://jumiwimov.ru/strik?utm_term=convertir+de+centimetros+a+pulgadas+en+pseint PDF link annotation
    • http://wordsideget.top/persepolis_book_free_onlinersj9c.pdfIn PDF document text
    • http://bcipreactivaperu.com/martin_luther_on_romans_8vfj4t.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/coulometric_methods_of_analysis.pdfIn PDF document text
    • http://dorightschool.com/86158635056s8tr3.pdfIn PDF document text
    • http://loxotuxer.22web.org/xigoturiredifove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_6027c947108a4.pdfIn PDF document text
    • http://reawont.online/224915996439ryxn.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/jidjj8u/seroquel_medication_information.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/Zhfihjh/browser_pro_apk_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_605714f8b6246.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/ihgjjAu/uscg_aux_uniform_distribution_center.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_60221b93e3719.pdfIn PDF document text
    • https://cdn.sqhk.co/wejoladixuso/gjmhesR/gun_n_run_shooter_infinite_runner_boyfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/jehhfjd/t_mobile_near_me_phone_number.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/f94c4132-4f88-4776-a76b-37adcdef6515/great_outdoors_smoky_mountain_smoker_parts.pdfIn PDF document text
    • http://kikumofesokir.rf.gd/alert_user_guide.pdfIn PDF document text
    • http://resizov.rf.gd/haryana_b._ed_online_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b013ee19-ca3d-47d7-a5b8-fdd6924a1da5/22265217507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917df440-6f10-4b23-b074-605c210342f0/is_5_minute_crafts_legit.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/ariens_rocket_vii_tiller_engine_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443d475a-f492-4e60-941a-fe9c093aa1c3/zarezokosilovosafita.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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 5356 bytes
SHA-256: 8ac3f20c838c51a0d397b2227e1f9b167d76bbf795025fb7bec855946b6c587e
font_01_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 9216 bytes
SHA-256: 1b1acf9004ec98180231789d99ab6728d357b31315b9d1a7f386583714404a71

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