Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c24abd7aae5016…

MALICIOUS

PDF

70.3 KB Created: 2021-03-01 17:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b0850c66ea17d42771ef41adaed96bb6 SHA-1: 0a276325653fdf61638b8cb161a3bf812e9b48d3 SHA-256: e4c24abd7aae501644315df9fc79974ba718b577bd9237536b9aec390a2f7c9c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm designed to redirect users to various other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to distribute content or potentially malware through these redirects. The ML classifier and ClamAV detection strongly support the malicious verdict, suggesting this is a phishing or malware distribution lure.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=bible+for+dummies+audiobook PDF link annotation
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/sutasel.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/pixesulunan_fagexisa_nolenekonema_munukodedud.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/38012544724.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/ac3141ff.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/7130267.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/710c521ce0c.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/ifK4jak/general_electric_universal_remote_codes_for_seiki_tv.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/a_que_se_debe_el_dolor_en_la_espalda.pdfIn PDF document text
    • http://vifijes.22web.org/waporovo.pdfIn PDF document text
    • http://rubeparef.22web.org/bsf_questions_and_answers_lesson_11.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/muwemivumazulax/juxawelejepigazupakenive.pdfIn PDF document text
    • http://kunivoji.epizy.com/cdf_file_format_mass_spectrometry.pdfIn PDF document text
    • http://rimiwomo.epizy.com/3002471590.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/tewewiloviwaja.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_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 5304 bytes
SHA-256: 91132e99e2d0f524b0bbc99b134797a0034e85f5b723f29be2c1c21c912bbd12
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 10264 bytes
SHA-256: 45ba9f6c38b283e027313aec9661622a65688146a49fb3c3e64a2e61978b0c04

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