Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b02b070548abd70…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 21:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52e151cd0ffcf095408e6c6fd4e5f124 SHA-1: 9c9ce07679f1b46292887b6155fbb69a555384ce SHA-256: 4b02b070548abd7070000d557dea027c8482c2f7ef3436c0021ca5dcbc004093
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links to external websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=springboard+mathematics+algebra+1+pdf PDF link annotation
    • http://nature-revive.org/files/file/zixus.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d23f291125b59fb9d6181b71648d1fed/siporukiwa.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/bebixo.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210910023026.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/mefejixikojebomomezovod.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904022037.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/41084862280.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gomonalotibusagito.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/mimuvegurowolatobubojo.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/dapujemu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/dezunur.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/biridoze.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/kemexinuwekezotunevaguno.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/newulikamopivizisameloget.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/9158427306.pdfIn PDF document text
    • https://uangraja.com/contents/files/latojaruwewutejuva.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/20893141793.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/32700359075.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/ponesolojabireranepivitus.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901195825.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/85000869556.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/40536815827.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/22547093838.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/37201492455.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/15103742790.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/38127029211.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_off0000b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DB 11332 bytes
SHA-256: a07e59ef1c712bf9b082358359c0334df436208e382678aa8ef3ed67ffffcf56
font_01_sfnt_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 14132 bytes
SHA-256: 1d8d0f440ebf92e39c1a739e66e6e8c63e6f94561af58ca26c442c20ee08c60f
font_02_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1