Malicious PDF — malware analysis report

Static analysis result for SHA-256 5326ec7b689ffbaf…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 13:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2c31e681d3841fd92846450f2de7bdb SHA-1: 068ebaa4291c2f8ab585fc5abeec722f3138ea61 SHA-256: 5326ec7b689ffbaf90c697938280ac9ea294a00aa2d0e710c95d533154fa0406
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://otestmanager.com/club/data/userfiles/file/20210904215048.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f170110211---lesemasiwusologadokiteka.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905044939615542.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vawiwuta.pdfIn PDF document text
    • http://agilesolutions.in/uploads/lujaduwozazivizorawukake.pdfIn PDF document text
    • https://rinducm1.com/contents/files/lazelesibupapodofezumome.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/nagimefug.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/29938454906.pdfIn PDF document text
    • http://gerocuki.hu/user/file/forajuvagizati.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/waduf.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/74db4b111c435ce695e3983367b0bd9f/3456167765.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/55628867273.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/30644165582.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/busovanap.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kovarewenigugukimivifegul.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/73430631439.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/43167293014.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/40122218852.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/34618008619.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/39694009179.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/luraxuxewofijeliluni.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/96337659308.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/96873985633.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/dubelasenudixuzagujes.pdfIn PDF document text
    • https://menu2uplus.com/images/file/falerexubagitivaxuloti.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/65039736740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nsw+teacher+portalPDF 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_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 17344 bytes
SHA-256: e4abf1eb3d230dd8890b1f632c7e032122e07bb189c46fadb69d458ddb9705a9
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10340 bytes
SHA-256: fe38ac50626994418ef947ce41cd944d60dc3e25d0bfeb22b57ceaeebc8d2724
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1