Malicious PDF — malware analysis report

Static analysis result for SHA-256 423d3f771d0340d5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 15:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77a52c4d23768f7bc42d880131059b9d SHA-1: a8ae34ea9943acf309a2fbe06178728679c3a805 SHA-256: 423d3f771d0340d5565b4c5f1dbc46af9f6696c75994a55af250862188527f91
134 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of external URIs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or malware delivery attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it likely serves as a lure to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lozipotod.ru/award?keyword=accounting+terms+uk+pdf PDF link annotation
    • http://tefiwofo.22web.org/kososigase.pdfIn PDF document text
    • http://majinukosazo.iblogger.org/jukavepasijon.pdfIn PDF document text
    • http://loluxeloju.iblogger.org/murakesapob.pdfIn PDF document text
    • http://juzirafotiwiwa.iblogger.org/repavifesepekiku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_043c1bbc1a614e1db63e3b1a40d1e075.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3347ec33-8461-46d4-8d5f-8c41aa574c68/caterpillar_gp25_forklift_specifications.pdfIn PDF document text
    • http://sokurunofizune.rf.gd/sagigupokizeguk.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_243404646e244a2097c86b8711af9ba8.pdf?index=trueIn PDF document text
    • http://fanirivi.rf.gd/sadefavezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6bf032-f33d-4afe-af7c-b85b9173c5dd/95206822961.pdfIn PDF document text
    • http://bikumekomem.epizy.com/diabetes_mellitus_type_2_treatment_guidelines_2017.pdfIn PDF document text
    • http://xadezifu.rf.gd/ronco_showtime_rotisserie_5000_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6789d3-67e9-4aca-aeaf-fcf020f641b6/how_to_write_a_personal_reflection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913a817a-ed41-444b-8479-fea0a89f4443/my_zombie_myself_analysis.pdfIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_6e6f168369f343b1974747d45e8162fb.pdf?index=trueIn PDF document text
    • http://mulagokonud.rf.gd/28792713929.pdfIn PDF document text
    • http://fabupumow.epizy.com/invite_letter_for_interview_templates.pdfIn PDF document text
    • http://futotaze.epizy.com/importance_and_benefits_of_effective_communication.pdfIn PDF document text
    • http://wupumodo.epizy.com/technical_drawing_books.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/gezajuz.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 5284 bytes
SHA-256: d755be60cd0f1f0d207ffd2827a058184be8ff47216b7962eceb1c68a8d8f1dd
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 11304 bytes
SHA-256: 1d5dce2fcdb703dab8251413315a5468fdc3d0686a1c294304573e3acf6fb710

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