Malicious PDF — malware analysis report

Static analysis result for SHA-256 3077a1b5d928831b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be35e8eae2a019342c1705cd2f419ba8 SHA-1: e6a424edd12abf7254df16a98984a78084eaf8ed SHA-256: 3077a1b5d928831b37d0db292b90fe5f22318addcf30e584b675108046eabada
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users, indicating a phishing or malware distribution attempt. The PDF structure and embedded links suggest it's intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=fortnite+is+free+on+ps4 PDF link annotation
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/gijejamoka.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wimukakimujelok.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/pigedurufelidilarozu.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/moruvekusonosabipid.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/rasuduxexikotom.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/sorusi.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/91389295563.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/penuvapotok.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/ruparuvaleru.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386710b1182---91830656177.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/63002034516.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xavizonolononutinir.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/77386515431.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dikexofopilewalev.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/besolezi.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630801700.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/66016411635.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/11410329272.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210910185932.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c382acfe7---2638326897.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/765442176.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gakexusadevel.pdfIn PDF document text
    • https://iohrp.org/f_files/files/36433643313.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/24219330130.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bedesilenalorixetu.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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 10196 bytes
SHA-256: a4041661579291c957825555b2a20c538dab1325ce6561567c67e55d6d38d026
font_02_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 15000 bytes
SHA-256: 58f31b3a3fc0ca4f8cdabcb123c642063cb2ed5e58f583f0a13a467d9f1cd33c

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