Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cd453774ecb311…

MALICIOUS

PDF

106.9 KB Created: 2021-09-18 13:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fbc98506cfeddce517d5b4a398285cad SHA-1: b8bddbd0b83b70181f5d38f968aea4116bc867e2 SHA-256: 95cd453774ecb311b81558784020942385ed4806c5b0f51b8759d51cc29db27d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://artediapharma.com/upload/files/toxuno.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161341e77007b0---niwajezugoxeteluxowido.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109020103174639.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dalufezurisor.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109062043131124.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pegita.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/35715469044.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/bojegigowezudasogilurovij.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/45888984566.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/75377144236.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/97439029061.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/51283319673.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/susemuvewefonojujobobi.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/xotugiro.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/moremajowov.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fanulaxovemuxobafizinim.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58535850246.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lavuroxuti.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/gilogonijifunuzofogujo.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///bikeruzusesezumigawe.pdfIn PDF document text
    • http://enewind.com/pliki/file/84605007294.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90785704979.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/20250712515.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/66982471513.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/gubetesemekub.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/30025717391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=demeter+ancient+greecePDF 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_off0001383b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383B 10240 bytes
SHA-256: dea3bc645a75d7cd45c38a3045269c30c2cff981ac1315e8a3ed369dc595f7d2
font_01_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 20836 bytes
SHA-256: de6f2e911e491a80483f913379453c373054df303654142c06f959537539bba9
font_02_sfnt_off000185ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1