Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4235f9f9bb330fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 23:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3c874a95947a41d745e7c5fb77d36cd SHA-1: 30d57a7c8c2d21a2a76dd50e74bb7d0a99c579f3 SHA-256: e4235f9f9bb330fb6661dfe9e7d79c779909873ce5ab50c3a319c0a12d2e1ae5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cfi-registration.org/buzzboxgift/img/userfiles/files/78376778390.pdf In PDF document text
    • https://foulardfotografando.it/file/zuxebibetezobufox.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jejozobezeposabufose.pdfIn PDF document text
    • http://myredm.ru/uploads/file/nefavafobowowopodozexiw.pdfIn PDF document text
    • http://scpt.it/userfiles/files/43547517517.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/goguga.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be8fe10eb6---86132729259.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/dozot.pdfIn PDF document text
    • http://irollee.com/userfiles/file/mixijizegafogudifidowaman.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/59486509913.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/papap.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/xutofol.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918191111696.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/bukulasulinebuneloguva.pdfIn PDF document text
    • https://yodobashi-church.com/xorafuguxov.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/86617111759.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/63514186981.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210918_123027_200.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902204343481.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/rofedosesoxasurujedunare.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xivefibuxotusat.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/60898689209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=madden+21+iosPDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 17020 bytes
SHA-256: 8e3ff6938bd99fedfcfe72d2ef227cf1c87e9f387d774aa2779c1f802e6d27c9
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10164 bytes
SHA-256: 1135f9712c72c1900fbc7666046dba1ee22f7bc5d521778638bcfcc1de9c650a
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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