Malicious PDF — malware analysis report

Static analysis result for SHA-256 0466ea59bd9e5f1a…

MALICIOUS

PDF

67.2 KB Created: 2021-09-27 22:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0dd8a59c8b31982bf574dcb4b7f0952b SHA-1: 160f840fb9f191d89077751621ea99aba03a6c2e SHA-256: 0466ea59bd9e5f1acba85ad3848f2fdb0cb6e5c14ca3ed322d0a4b495e62a0fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this behavior, with many distinct hosts and UTM parameters used for tracking. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=easy+mp3+downloader+for+android PDF link annotation
    • http://jonkmp.nl/img/cms/file/korefutonipifuvanujesepu.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/woxakazituvuvunobal.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/nizilunofuzoj.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/fivoluturetodaluded.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/jerutadowavunafonodiri.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101736392319.pdfIn PDF document text
    • http://gzwep.com/img/file/202191185759.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5dfea9c4e6a1c82c720259017e39bf58/pevezukewu.pdfIn PDF document text
    • http://kmsenior.org/file/files/lerano.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/tadeforitibefid.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/luposadomejor.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tefovivo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2add3ba00.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/jitin.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/nisomulasidexuvixe.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/duremolevirukomuxisasi.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/86478299038.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fefowenepupedon.pdfIn PDF document text
    • http://tercovci.cz/files/file/jutapelexoluduwes.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/kisimiladuxade.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_off0000aa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA45 14360 bytes
SHA-256: f2335106deb2b101ab18f9dcf1c42f13f41502de54e4c0cdd6bcc8c93783831c
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 10916 bytes
SHA-256: a57392107985c144c94d735c29ac99bdfd45dea357421d2c7d90a91eb3939247

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