Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0005be48eb00623…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 17:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4297ede175b07b24d82036f5e09da27 SHA-1: 3d1b0f250281666e8d2f46ce7ae072239837d8a3 SHA-256: c0005be48eb00623491c216ca80fc9de08f82ec42e64957f125e592b578a6106
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and the use of UTM parameters in one URL further support the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://caratow.nl/userfiles/file/89788319608.pdf In PDF document text
    • https://aletihad-group.com/userfiles/files/13156688783.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/26743259950.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gukakivekirupunufegosinod.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/31718123876.pdfIn PDF document text
    • http://fluorescent-training.com/file/vinanexonuboj.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/79466273792.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/46630308538.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/jevazu.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/punebugemagu.pdfIn PDF document text
    • http://splogservice.ru/content/file/xewodexovojufil.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/70287250258.pdfIn PDF document text
    • https://southafricapools.com/contents/files/kotowijopiradetovorus.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/bovit.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161302ea8ee9c9---86407414324.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/mawomaw.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210916_B4F55B44CC9C3796.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/nosudulika.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/mizezarebomajuwuzipo.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/xuziwutinumolazumajari.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/55908221798.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/82619431237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+speech+recognition+languages+supportedPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10876 bytes
SHA-256: e8812e060f4334ec8d56297f570d6dcd6fbc6011773cf9514ae65b4910f91339
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 18124 bytes
SHA-256: 9841a0bf7fe06af08962f93dde701b095c189d9ac15d25da9f20c2842992efbf