Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b028f76e6384e1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 22:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73240f951b876b07f4e728c41f6b936c SHA-1: 8cd78a1dd5631847da546f27692a484747891350 SHA-256: f7b028f76e6384e13639cd12a2769f61cb4915d22e73b3f6b617bd206b613035
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links and a 'download button' heuristic suggests a phishing or credential harvesting lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kxxbs.com/uploadfiles/file/a/roxiponazegigewevite.pdf In PDF document text
    • http://daegyung.kr/userfiles/file/20210920115816.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/mutapubosafafujofebodag.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/66942948298.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/38398361622.pdfIn PDF document text
    • http://lukinserv.hu/file/tuzuweluroluma.pdfIn PDF document text
    • https://2winit.com/Files/files/bekisiluz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac013130e7---78752073843.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/kedafivatage.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/jumosiwivo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/57914509680.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pirisurodupi.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/jazewuwowaluxakel.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/70998295109.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/2906575820.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/62319478661.pdfIn PDF document text
    • http://cudicio.it/images/file/sowupenarutukitirepodewap.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kewixure.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/zusivusudavagezomiwinudos.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/rolesefeme.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/wezubodoroxokakemibil.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/pafusigawakurafuvuxuwevir.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/93217581514.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/61671722405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=timer+android+tvPDF 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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 18208 bytes
SHA-256: e29777a5b82be7718d91dae16a0de1f0c83bf300f1374bb0b017148b451c94fe
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 10224 bytes
SHA-256: 1e69f2f016736ade8b18dd5eb565dd154874dba7b1276b9e56e2b20d1b4c55a8