Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c324c37f662d36…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 12:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d447acf9f3474ec9a878a99377646b5 SHA-1: 550a7eb6331d23decf0fe39c60e6db3fd00b0eec SHA-256: 08c324c37f662d36570c2568859d00ebe8c87d3e0fdd14808be1773d4e29206d
126 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many pointing to potentially disposable domains. The embedded URLs and the PDF's structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bdnchem.com/upload/files/fopibuso.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/67421434714.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/egltudckkmtk0u6v3e0b1pqb0a/9353025651.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/48354923595.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/41029817699.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/jakuvuzu.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/39513687916.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vijexogufuwutorepelusale.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lagisinufatukawafo.pdfIn PDF document text
    • http://zae.me/datafiles/file/77752280688.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/sumavopunukepobedabuzit.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/6805364018.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/xazulisalaziduxexiwo.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/biwipurelalefex.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/mepofogefagibame.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902125105.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/90876289203.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/rowomas.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89207e138---duvigibezuwutodu.pdfIn PDF document text
    • https://digireg.es/upload/781433761.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/vorobekujelaroramumovo.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/99907870989.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zobisosovogifizavirumewi.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/togemitupikaxaxoto.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/bujupilijelemuwuxebig.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/gedasemimot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=line+let%27s+get+rich+mod+apkPDF 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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 21352 bytes
SHA-256: 46f0e9129aa63edc659b0947d0958564764c5f1050ece7e61df3b1928cd6e27b
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 11044 bytes
SHA-256: 29405f27db9fc4a93b1eb5a67a6598b580c8831282d59e681e8c21c8ecc950fc
font_02_sfnt_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1