Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bdf69194d736cf…

MALICIOUS

PDF

87.8 KB Created: 2021-09-23 07:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd87931af8ca9b89d2cfdbddee06cf93 SHA-1: 13e85b66f93936bf18a5ae04bc6f8e77c15609d0 SHA-256: d5bdf69194d736cff212c587f1c382ba875bb965fa296496ffb33e8105ef388c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where the actual payload is encrypted and requires a password, often provided separately.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=es+file+explorer+original+apk PDF link annotation
    • https://fejlesztes.codefon.hu/js/ckfinder/userfiles/files/xamusipuvevu.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/delutoxowoguza.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/80376160083.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pimesejawalun.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vawajuj.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/27453167047.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/95340125368.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/38505558846.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/6257797212.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/rinomedilafugib.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/25627938081.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/70413099099.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/16229218755.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/zakusimurapaloroniletedu.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/nukosezutivoja.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14256895476.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/tugasugipefoziregejoxumed.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/66234126651.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/togolumozuzej.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/fuguwor.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/nolozikogumizazereduvuse.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161426a69a7c53---55900237098.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/6705599302.pdfIn PDF document text
    • 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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10612 bytes
SHA-256: b8197fc95a0c406aed65eb87627e670b8f333f0530974c68154f45d632a82a77
font_01_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 18372 bytes
SHA-256: 18a519be46dc25d5869d9e3f63488843d6f099eab76c7f8e4e682a36cc373744
font_02_sfnt_off000139c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1