Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d24ec7aacb0760f…

MALICIOUS

PDF

85.2 KB Created: 2021-03-28 08:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0632a8fd3f950a1b5c414a2405a16159 SHA-1: c5cb9d916e0db495063975579d5f6854cac70adb SHA-256: 4d24ec7aacb0760fa944b702ea639076ab2c2ddba741d5cd2c56f117128867c1
126 Risk Score

Malware Insights

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

The file is a PDF containing embedded URLs that point to suspicious domains, flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites for phishing or malware delivery.

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://bologen.ru/award?keyword=rechtschreibung+%25C3%25BCbungen+pdf+klasse+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479237/normal_5ff871063dd46.pdfIn PDF document text
    • http://erogan-encolumbia.site/balance_ball_chair_base_onlyvop1z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478655/normal_5fcaa6ade49c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_605ddedc50f5a.pdfIn PDF document text
    • http://goodik.fun/43518685113t4t5u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_6056ad2e0334d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_5fd7115636164.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/what_are_the_factors_affecting_school_community_relations.pdfIn PDF document text
    • http://b2b-servis.ru/ejercicios_de_limites_al_infinito_resueltostmt2t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_600349fbdc439.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/da69d8ad-f84f-4baf-821f-72f25c586267/food_safety_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/sofogutofopalufozasobajag.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/first_angle_projection_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ee344f-90a9-4f45-b5b8-26335031d985/pisasovajekip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f516240-328c-4823-a174-a536dc85451c/is_screenwriting_a_realistic_career.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/sejakosakuvabogupes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75649e8e-c5cc-446a-888b-ebcb43e9692d/hoover_windtunnel_belt_replacement_38528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38d68e7-ce46-4817-bb36-8fee3a2b7fd7/7727148963.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_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 5828 bytes
SHA-256: 7bcbe0de57186d60f58cdc0711086f2f950254cf6273c4813e51b6b3fe067469
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 12584 bytes
SHA-256: 48b03d8530ed1d57ebfb94f2a2728d06ece32aa2a63895dbe805d63d765b4cd7

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