Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb1436277a8f22b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-23 22:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 855e83cd10f8557e167d2ab30b717997 SHA-1: 0866ad4b182736a9543d45557e062a06d314e3da SHA-256: 6cb1436277a8f22b9d38afdf9712284aafef909aad2e9f07b66cc7c615ced2c3
146 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, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing or scam attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vagtteam.com/userfiles/Files/wizovupafivegu.pdf In PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/82259114887.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/sijetazilejegujenu.pdfIn PDF document text
    • http://zatacorp.com/upload/files/80296723650.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161321605d7cef---63330004067.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381aecd3658---liponubepinupe.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/disotikotanisajo.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xoworemafunufuguf.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sitowixisufap.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/mefuwufuj.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/75108962245.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/42602551631.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/kewogej.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68581608661.pdfIn PDF document text
    • https://fuoriscena.eu/file/51486438711.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/16501348691.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/38274917738.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/40817469990.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/29009428978.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/32764251180.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/rakawaleb.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210911191616_1616028007.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/novurutujamuvojebezove.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/43427224723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cooking+fever+game+download+for+pc+windows+10PDF 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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 18592 bytes
SHA-256: d0ac6e4a0e4e1beb2250df2c242a1405b041ec16ee05bccd8edce355069f47df
font_01_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 11316 bytes
SHA-256: 2d531c13eb405cadcc94e2cb9369a4d7170c10ea62705802bca702d2fa7f2939
font_02_sfnt_off0001392f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1