Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed44ba53c2857d6e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 19:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4e183161a7665e31e68d2e3733f1e2b2 SHA-1: d17f2c134a075af9bc0520e15984c4e49d860a31 SHA-256: ed44ba53c2857d6ef69a68a4c50debd061caed67d37f5b97e6648a638e049662
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF's structure and embedded URIs suggest it is designed to redirect users to these external sites, likely as part of a phishing campaign or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=sindrome+anemico+pdf+gpc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412889/normal_6030feea83fdf.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/bookshelves_plans.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/sofirosejulavarikaxovimi.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/1dijlWe/chase_the_bag_stacked_pants_fashion_nova.pdfIn PDF document text
    • http://jumbochecker.com/1256656030yn5x1.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/jcheKhg/34913156106.pdfIn PDF document text
    • http://siondez.ru/89794056975iq9aq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_6023622c9f5d8.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/hihbiJC/mass_absorption_coefficient_of_water.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hchgiUJ/delete_recent_files_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5ff9466685cc1.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/passive_forms_of_gerunds_and_infinitives_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_602a7a78a9e47.pdfIn PDF document text
    • http://tuimag.ru/medical_surgical_nursing_7th_editionc9nss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futakanawus.onlinewebshop.net/36504051667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc23539a-97f0-4e32-932d-012433f55418/dizebafusigejobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2498ab96-12fd-40c3-af08-82cea24b297f/how_to_study_for_ib_physics_hl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe93eb2-7273-408e-b32e-a77832e3e9eb/market_marketing_plan_definition_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829d227a-4395-46a4-82cd-76507453ed79/4121704611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e18f020-cb81-467d-bf7f-f3efef083d4d/craftsman_208cc_tiller_carb.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_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 5368 bytes
SHA-256: 8f95aea299a2d99c8f3af18376fd3924468d5223472f5992bb3c671d4add9f79
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 12284 bytes
SHA-256: 670f5e06031f3a1adc23a362e1fd90b559f25c7449983606df920da2bd87ac6b

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