Malicious PDF — malware analysis report

Static analysis result for SHA-256 78094a4a5f672c50…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 00:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e5d5f8c7ccb0517cdabc79eb70a870ba SHA-1: 03a3baf30a04c57f3ea43fbe3df7ee2ef6ffc9c8 SHA-256: 78094a4a5f672c504be6d2695853f6ae8596178f3e40f1b8a29108d2d7df2a1e
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 a large number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a strong intent to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=fun+with+ragdolls+android+free PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138107b5e2fd---zorije.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210911_9324F4A32BED7CA0.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/26974365748.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/87997344023.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zubotu.pdfIn PDF document text
    • http://floramarble.com/uploads/36418382328.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/gorikazarobupuj.pdfIn PDF document text
    • https://el-tall.pl/pics/file/83465889711.pdfIn PDF document text
    • http://kelvista.lt/images/files/66393977933.pdfIn PDF document text
    • http://mopron.ru/upload/files/83763212899.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140069e7ff1f---32605583513.pdfIn PDF document text
    • https://fong-cai.com/upload/files/nurimibabegebop.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/56738383091.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/popuputetuvavolodorafoz.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pumivotimalaxerizu.pdfIn PDF document text
    • http://machulski.com/public/file/fikudevofu.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/32877841076.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/tokugemazabubatikinima.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/jeloxevopaxa.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/26987614113.pdfIn PDF document text
    • http://sdes.in/uploads/navonopunepamidut.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_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 17372 bytes
SHA-256: b8fda7d2f441bea5517b18af860c88fc8e792a0273e03d74ad5de58f937b6e59
font_02_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 10796 bytes
SHA-256: 894d08c7a07171b298c14ce3b9e201c9f3a45227b302e8e5cb402dfe1452220c

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