Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8ac4d04d5385b0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 20:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8778b9de004fc3c49b525ecf3bb0277 SHA-1: acc145916315f4b01e4fe690cd2f341d5f635ba8 SHA-256: fb8ac4d04d5385b0df7b5a69eb4c826e66c860996e837b0d0d1e5a4b15d8434c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs pointing to various domains, many of which are unknown or potentially disposable. The presence of UTM parameters in one URL suggests a tracking or campaign-oriented distribution method, consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://nowator-zpu.pl/userfiles/file/64731606055.pdf In PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/7935898578.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nivoxilefotejagetol.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903212416.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/28288951694.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///nupokudupa.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/5862923208.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/sunodutibadaxezutepud.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/vabogoziramabalopibem.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/14279264429.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/92137786681.pdfIn PDF document text
    • https://nasikampung.info/contents/files/saxazufaxuxusawumexivo.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/fiwepa.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/disevelevakodovuxixexab.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jonozalov.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136347f6f026---tojizewekaxetopukulezi.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/jowijojuzitilejasexiveke.pdfIn PDF document text
    • http://cartopack.be/Images/file/widokuxilagunobil.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/306303581.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/todigu.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/jinazafokafufujexom.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/31057742268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+mirror+apkPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/torolowoke.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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10636 bytes
SHA-256: c43d83a1a591d7c1803d0387145d098febd4ce34b167bf06d910b4ee5f06bc43
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 18152 bytes
SHA-256: 80983fe794bd1c17db6898bf0a8843a6c4e0312c9c8d61de466725036b63a970
font_02_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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