Malicious PDF — malware analysis report

Static analysis result for SHA-256 494fd1d25ba70fae…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 06:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86f06685cff89bf7c27bf56386d542bc SHA-1: 0cfcd694136309c464f891e02a431341eebcbf18 SHA-256: 494fd1d25ba70fae15903d1293899d0650566efc6e6e88201dd9594b308aa521
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or redirection mechanism. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or SEO abuse tactics.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161333b1ba9dc0---20812993738.pdf In PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/liborufapusutaburelale.pdfIn PDF document text
    • https://penzion-palice.cz/content/13564383246.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/57500019488.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/fiton.pdfIn PDF document text
    • https://umutfm.com/resimler/files/22814639599.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/tefabirututajogubejasa.pdfIn PDF document text
    • http://texmet.pl/userimages/file/mibawesoz.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/71343163529.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/88716089616.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ls7dkvhjk4fnbe0e0ikp4c0cco/88063910678.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jupanazovuzexidu.pdfIn PDF document text
    • http://kodemari.info/data/files/benebiju.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/towefemoketabag.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kelat.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tizivo.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/81349609864.pdfIn PDF document text
    • http://szjg.hu/images/file/86165399806.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/58839900250.pdfIn PDF document text
    • http://farashimirooz.com/files/veziwelirelafuriba.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/40445292556.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bofovugobiz.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/85996048865.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/xazenepetojaka.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/jalusesolurodalusatovewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=top+qr+code+scanner+appPDF 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 17120 bytes
SHA-256: b999f75c5452dd78a55d9f63fa606ae5f975371d888af1896cf3d17802112e1a
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 10380 bytes
SHA-256: 085865e8a4634e727b9af2242dc3714487e74919770720c904b5d06a86dd78fb