Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c4ac7668a81401…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 04:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a67e2b62c4b684a9b8bf896abc27e06f SHA-1: 97cde7f710b7d70ea81463a77697943aa14b2b70 SHA-256: d3c4ac7668a8140134d0c78f8a0c73ee43311be4df9c5dd33450fb4943f8cb6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a significant portion pointing to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://ctyhoanongangiang.com/userfiles/file/dijetaso.pdf In PDF document text
    • https://sagarexpress.com/userfiles/file/fevofiwogebanuwi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/56321046935.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/12745074392.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/mokivuwujubogawobizo.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/visigubiginivoleduluji.pdfIn PDF document text
    • http://ccadl.com/files/20210905050731.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/61528139266.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/20889395876.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/14044852837.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5189a4f99353daca3c4bda6e2d8aa5cb/mozafegufugavuzebosetoxu.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/1238622699.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/suxoxezebepasupiluwata.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/34169473481.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87255506210.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/16767631357.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/49060754381.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pexurinutawos.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/zigow.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/fojoritebanolajelanepuvap.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/sodomadakavefudozosufuk.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/famigidoradonixuro.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/fugalepuzusiturawo.pdfIn PDF document text
    • http://asid.rw/userfiles/file/16008811502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=anatomy+of+facial+expression+pdf+freePDF 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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 10976 bytes
SHA-256: 649fff6cbf4f83b903bf966945b00a5d8ddb87b9b748f25ee1c6fe7d717ad2d6
font_01_sfnt_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 15396 bytes
SHA-256: e1ca6aae92cdf61f060dfb84afe9d79aa8399ed451586a9267d7b1c46306d3c3