Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8a03cfe88c3370…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 20:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b2e75cb96a4a28c35d6c34e9830d9cb SHA-1: 8a5deea32697309955af46725104a5d453c95fc4 SHA-256: 8d8a03cfe88c33702dd0ac18290f5bad7fb60454cd2652666a1620e815a8d7f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on potentially disposable domains. The presence of multiple unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allineers.morefriendship.com/upload/files/3785403557.pdf In PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/3260840753.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/kowigi.pdfIn PDF document text
    • https://thehouseproduction.net/file/8046723566.pdfIn PDF document text
    • http://airmon.hu/images/files/roxagebipipiw.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/96561970159.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/mixakopi.pdfIn PDF document text
    • http://abwessex.com/uploads/files/faretidowupuw.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/rilurakerug.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/89690697369.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/zumizo.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/39787742088.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109021256291366.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/43829885192.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xaruxagetofawexilad.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/fokipoxisojapigiwok.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fff3a958a---xojotomomirigadelazo.pdfIn PDF document text
    • http://spharma.ua/files/file/73776494085.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pivesukirizusojenakufuxa.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/mewodimudatevufege.pdfIn PDF document text
    • https://cristalensi.com/public/File/kilofiwetepujimozes.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/dewuvomi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc1512d03---fimot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=organizational+citizenship+behavior+theory+pdfPDF 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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 17152 bytes
SHA-256: 7e0bcebc8b0436d81d725359062133d5d6a510620e1bba77823f9854c1e7c4cb
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 11304 bytes
SHA-256: 0a848ce4b15c96f14ac7813324080c6487d60927580f86c408f2bd685942a2ec