Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b3469efacfd8f2…

MALICIOUS

PDF

74.6 KB Created: 2021-10-04 10:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d561ec2c5bf4d3975595dff8c55c1be6 SHA-1: 7bc743f9b036abcecd5a1254ab938b9011111731 SHA-256: 09b3469efacfd8f2e04f4e43446b6bdeda5d7d71646d140f6a28549f06778fbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=2010+playboy+playmate+of+the+year PDF link annotation
    • http://kepco-group.com/uploaded_files/userfiles/files/murejawu.pdfIn PDF document text
    • http://djapm.com/userfiles/file/59829558436.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/38643633160.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fdc5593e---65360991916.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fobigujekazatoluri.pdfIn PDF document text
    • http://weshare.vn/attachment/files/mekosamu.pdfIn PDF document text
    • http://gysanya.com/upload/file/210901153415256447x111cdhiicox.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/28560442957.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tnv0nec1indltgmp0t362v20j6/rugijiputunowaxa.pdfIn PDF document text
    • https://geloracinta.com/contents/files/13172747311.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/melosapuvuvadejiwetobezo.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/rosuxilatum.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/wevodazef.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/filunu.pdfIn PDF document text
    • http://hrudolf.com/userfiles/tutuwenivilofif.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/pegirixapetukejijem.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210925060759.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/53392344580.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vamabativosuji.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210920172100_90354088.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/8051654096.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/97260762684.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/87192487035.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_off0000bbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAC 18040 bytes
SHA-256: b834aad0da666999386db82b917b04057ea267cd935150b3d7a80f18b3ccaae6
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10708 bytes
SHA-256: 7fe38aaa03af48ce299c70d6e089c50f53a054e9b499d8f641c494f00f063e15

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