Malicious PDF — malware analysis report

Static analysis result for SHA-256 8742a0d8eeb360ef…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 12:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db4967f5861d1285dfc8a18b364e54ad SHA-1: 7bed375ddae75ff9a1a03897081103bf5f09a10c SHA-256: 8742a0d8eeb360ef38163d533f1a20b236eca677b1042e1ed6429c376a793d70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous embedded URLs, including a link farm on disposable hosting designed to redirect users, with one specific URL suggesting a download lure for 'solid explorer'. The presence of embedded URIs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://garglob.ru/uplcv?utm_term=download+solid+explorer PDF link annotation
    • http://santamariamikado.com/uploads/files/paroses.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/getinebonoj.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/57275658875.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/beguvamelekepitebukol.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/xewaterazopekelupaza.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/belafukugabojudunajinow.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/kututetilevadifelal.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/861038852.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/sedopogu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/donawokewuwutojaj.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/dogonofeniv.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109041206287988.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/fazatavunamamanoni.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/6075893306.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210922161511.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/14/81016423522.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/konumogofiduxomanedu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/mozab.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/firesebugexeda.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/vetuj.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68988072503.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/908538834.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/nugenal.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615570c92e917---gekax.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/xazadidopufozavewoba.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_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 15624 bytes
SHA-256: d1b7d53ace4d531c66623640e17cf90f2e61f78a32ea49dd1eb933d7d21f2b6f
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10476 bytes
SHA-256: de58d68a4919a55ef6f55c1e36c6aba280deca614863057cbb2843bc20581129
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1