Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0ac033171f0aaf…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 00:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 953fa721046466bf4b288dc90d6e5778 SHA-1: 5b6089846a34ae29f1337cc0e341cbc27a4cd3ef SHA-256: 0f0ac033171f0aaf81176d6b04ccbe5842948ebd37239d5c9c45e3662e4e9752
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) and the overall nature of the links point towards a spearphishing attachment (T1566.001) used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=ben+10+mouth+off+mod+apk PDF link annotation
    • http://vkp.ru/upload/global/file/57873838118.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/jupobavovarimixuxeve.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/97635907.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/48399353549.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/23829529819.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/lixelerinemawamubinutexu.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/13081926257.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/4167982423.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/14616541893.pdfIn PDF document text
    • http://aimic.com/userfiles/file/jubemiwovuzutuwopidasap.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/pukotutunumubixe.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/dosera.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/setas.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/58473389032.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e9cc843865f90ee48b200bdbcaf32dfc/16094966938.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/29255502118.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/zilojedudekobuz.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/miwalidaxowomabika.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dpc9sse3sdu9bgl2bibs1p990/jekinupemodivewekin.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/davulezotobiwuniwemo.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/92158138626.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_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 10776 bytes
SHA-256: 489538e1da9a66ffe916c7eb7dffbaa4d5fa0a638967d8f9d41a78f9e7a792f2
font_02_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 17332 bytes
SHA-256: 8e2d0c226237e8b9fc04f78ffd98475f6608a52895663e12984db6788b4289e0

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