Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0baed569123c075…

MALICIOUS

PDF

75.8 KB Created: 2021-10-04 23:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8ffe1016f9e8b81376612a7f8e41b466 SHA-1: cdf8a08f0643a0ea1d001646bee6604955082fc9 SHA-256: a0baed569123c075b77a3f2bb14dba3b7384e2456c16aa6d032c0fd1679c23d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a 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://infrive.ru/uplcv?utm_term=things+to+build+in+minecraft+for+fun PDF link annotation
    • http://andlupa.com/userfiles/file/zuludatag.pdfIn PDF document text
    • https://attack.lt/images/files/vijol.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lisor.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/mexitoseg.pdfIn PDF document text
    • https://siroyensao.com/upload/files/90590930276.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613090a16effc---mudelisivuwi.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210914175019.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf757d6fd---301128798.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/kugiguxavofod.pdfIn PDF document text
    • http://varvshistoriska.com/file/lalikubanozonewajozaxoruk.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/48749757322.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88198332676.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/zevenumewapodug.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/3009429912.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/zajevikun.pdfIn PDF document text
    • https://sangogiaphuc.com/admin/webroot/upload/image/files/salalumagipofo.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/luxivikusabeb.pdfIn PDF document text
    • http://c-six.it/userfiles/files/33362333046.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/27070592809.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/fijesopudaruto.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/lelubupipekowadadeliz.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_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 11128 bytes
SHA-256: 18a6744c09b3621a803d436c59dcf8ce4cfd2e06452941144bd1d049347b0e81
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 17296 bytes
SHA-256: a65cd2341753c812a20353e28c198ff96cb1970f9c5b940e81798797f642d386
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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