Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b9f58356f5d762…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 02:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f33bd7f6fbf6c4ebae9ab4e99d3c865 SHA-1: c9a50056bf708da9feb04bf4be60e2d96fa45f84 SHA-256: 83b9f58356f5d7625804e30f37bc9908333877501c07df7dbb3ac35b413ca41f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a link farm strategy on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=convert+indesign+file+to+pdf+online PDF link annotation
    • http://asbufestival.com/uploads/FCK_files/file/dekulimabavazuselabup.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/19650201909.pdfIn PDF document text
    • http://arsvet.ru/img/upload/kuzimovibavojanuzage.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/40466707061.pdfIn PDF document text
    • http://turnyras.lt/Files/file/30374977333.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xinuvivewiguz.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/ridajifopezedimewibawam.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/kepuputubezipuwamoretok.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/6184501796.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/72311325483.pdfIn PDF document text
    • https://duvanco.be/docs/files/ditevep.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/rafenilupezuri.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/tokazuno.pdfIn PDF document text
    • http://rinsacars.com/files/others/62182667141.pdfIn PDF document text
    • http://mobiliteit.nu/files/3783182216.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/fesinepejasi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1ad970f1530bc4750ce2f7cfa6a6babd/fumununufagonamewuma.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zifas.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0986629c---94747644801.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/79818009766.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/66780039205.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 16952 bytes
SHA-256: f55a8a5b0523d38702c94b3a505d6ad24cef969fa453ac379823b2f627477494
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10608 bytes
SHA-256: e2aa0011a1f0ff2fafd506f9e8d29c9aef82c69f83d39c84761661afa8699a28
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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