Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea54c9a1a1e511ca…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 14:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f081feb18a1a5f36e352a3c72b03de4 SHA-1: b8da851be77f392c64f8bf9b6fa75ff25ca6cf27 SHA-256: ea54c9a1a1e511cae4aac746e30f29cd9f3703935ad8717eef2ec523cdc9ec78
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, and the ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bedrucken24.de/userfiles/file/gaguremal.pdf In PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bevaxavurekogoki.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/83424463018.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090714483079624.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jusoviril.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/xovorixumawabonopudub.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/23239899955.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/samav.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf7d8dc6f---vorawatekezuwuzikanag.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/vobiribudaw.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100853573123.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gerabuvijavupe.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/24736683666.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/422932875.pdfIn PDF document text
    • http://clerus.hu/files/file/kozekosikajijadidizaju.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/16121843973.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/lefadanowideka.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631570615.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/logetomubefe.pdfIn PDF document text
    • https://hiroyoung.com/data/files/ratetol.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/32602064976.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/3460149265.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23f52e3e5---goverixog.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/72665936399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mac+changer+apkPDF link annotation
    • 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_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 18352 bytes
SHA-256: da0e525ffb0fff7b1d7b8b5a741e29bb864a2cfa95560a61a4b3da3663116c03
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 10216 bytes
SHA-256: 06717e416bc52f8b51d5ce2408997482d322a9960a4139b4db26a41c61a6f801

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