Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e4379f29096949…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 00:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22e9315547d0f02a6dd307ebb83bf68a SHA-1: 81999b1584c7935e47f07d8a2d743ba3b0e6109a SHA-256: 11e4379f2909694925fe348f7b7e5504faaef29944378ad4261ce1705853d9e5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains with unknown reputations, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

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://transdeliveris.lt/userfiles/file/sobubemukilumufivufuwaso.pdf In PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/131143336.pdfIn PDF document text
    • http://vititanon.com/user_img/files/tunubekixe.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/duruf.pdfIn PDF document text
    • http://totoumi.jp/upload/file/46672783239.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/rimilujimabifofebexiluto.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/10636803568.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mubesefodafa.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/tuzola.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/40416382070.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/45996766917.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/tilad.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/bidipigepisagowipex.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/61159834975.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/82945664620.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161308d4538afa---taxugudowovotedozovud.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/7747773627.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/jagonoxudikewadusameto.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fqcbtm3dp64js26qu8dravk7oq/14025721388.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dijezonozelupajiga.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/disapuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=colorfy+app+free+downloadPDF 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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 10364 bytes
SHA-256: c6e62ed37180a541f343422bae789f3d29b46398ea4178b2651194626b2ffc48
font_02_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 18052 bytes
SHA-256: f3497427df4dc7e3ba7859a1e741b4545fa3fab8bf9386d0af3159cbd8434401

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