Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5512b8f31080937…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 08:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6d15db20da1ad328bac65cf56213996 SHA-1: 8119831c8e2450a5b1f11c81ae1390143e3d8360 SHA-256: f5512b8f31080937726835bbac3272cbbcf994db73aceb0d5590c46e37222199
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to execute malicious actions within a PDF. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, particularly the one hosted on 'keitbg.com', are likely part of a phishing or malware distribution chain, aiming to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://keitbg.com/images/files/xisebosowupekipigosugabo.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc1e860b6---79616661837.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/zimifatitavow.pdfIn PDF document text
    • http://abwva.com/uploads/files/mupobuvutobedobufewura.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a515a3a392---51663415409.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210909000151.pdfIn PDF document text
    • http://iscelenie.info/files/file/50907532009.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/fusitolozeduzeliro.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tovip.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55787113586.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/61643598861.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210901133102_n7bo0g.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/81053254921.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/16961189314.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/26753464759.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/62053966781.pdfIn PDF document text
    • https://electroagro.es/pub/files/99205412922.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/45863976394.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lidepujop.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/xuwumusadekin.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/nesavolikaxisom.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26627819666.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/63351611097.pdfIn PDF document text
    • http://bienbao.org/uploads/files/7201063128.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/65821211234.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/dofibarolov.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kanaxob.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/safivolabukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wallpaper+3d+download+for+android+mobilePDF 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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10784 bytes
SHA-256: a8d1ef5ac4c98045f176ec608404eadcda5d31f10b95ad0e3ab752dc75b9ffcf
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 17212 bytes
SHA-256: 4b803fbe9e17600266eaed2a7873c1f1f790fa3b7dbf9e20d580d525ee94efd4