Malicious PDF — malware analysis report

Static analysis result for SHA-256 46eb4be8aaaa0aae…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 06:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e9be1c5049e607ed7ff777937690fb4 SHA-1: 7991242a2f54ea5d9a295dcbb107737868e1e026 SHA-256: 46eb4be8aaaa0aaee2952f60fb16373dd303048e97f42b8e7684ba2d95bca319
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing campaign. The presence of numerous distinct hosts and links within the PDF, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing lure designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://suacuacuontoanphat.com/upload/files/50471303518.pdf In PDF document text
    • http://www.39koratmachinery.com/file_upload/files/34984372410.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33883503459.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lemurazaparud.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/bisizazubikifilereroxise.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/24304559539.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/1152302380.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/xeduxegalug.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/gupazelulezudaxuf.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/gelonurutijusumevozula.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/76746538007.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/27225016246.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/dopafavomenakivawajepivik.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/24848000117.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614120afb77b2---jikixukesas.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/jonarepogakepadozowojamo.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xolatajakajaso.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/6041541898.pdfIn PDF document text
    • http://skene.es/userfiles/file/53791829571.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/ledepijegoxatamuwoweri.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/5102120398.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace3996262---93049482863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=galaxy+s8+osPDF 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_off0000be03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 18224 bytes
SHA-256: 8784ad1dc07468df5020584dd3587de8929ab2c066ce95b5bb2e29cd695f5666
font_02_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 10040 bytes
SHA-256: 57b8ea157a6ea57e53c80927dd3baaa3a1d1fcf003cbd2218b2d18e99f6e8d15