Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61457eb61326443…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 01:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ad5aaf86b528b6009effcb23ab95421 SHA-1: 1d87074e7e0a998133bde0f3a7fa888a47b39010 SHA-256: b61457eb613264435e8809a5b3458ed37efe9cf747c64113fdd6f6834bf1c894
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to a network of sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://wych123.com/upload/files/fupetelubemipixofuka.pdf In PDF document text
    • http://easyhypermarket.com/userfiles/file/90011290332.pdfIn PDF document text
    • https://primer-spb.ru/files/files/serulerutanabapa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614382a94c3ae---gewevifapexuve.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/78040288525.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/82775391926.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/rumutameniso.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/44356394263.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/kulokogewajex.pdfIn PDF document text
    • http://erdbau-rauch.at/vixiweferogisirupewokom.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///36901326309.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/50823422041.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_1355A3F3E6ABFEB7.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/68757571532.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210909_214745.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202194145212509.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/teranukezosodefogu.pdfIn PDF document text
    • https://gangnampools.com/contents/files/biwoniwasenuwezunifez.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210912083839.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/nusaduwu.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/dafevapafewedubakewazuxib.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zejegopitobunotiwajulilej.pdfIn PDF document text
    • http://spharma.ua/files/file/sabawibuvexenu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/njpqfsc61cic4sbcm7pibffm93/fawavekajufejojaxebopif.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/96956143290.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/30101373868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=toolwiz+photos+for+pcPDF 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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 10288 bytes
SHA-256: fbab8e5f2660bf408e08ec5f253f320bd14e7ac709c0ded0c2531fd2f524f14d
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 17868 bytes
SHA-256: 7e3a4d9f68f676bd642cd176d06d43029277d612940b07ae15f8720457b13b89
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1