Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ac7cd771fbe6d9…

MALICIOUS

PDF

87.6 KB Created: 2021-10-31 23:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3038c5b94bc2645274f26dac555cbbc7 SHA-1: d657be82df8fe76a715afd53b29197f2e56e41e7 SHA-256: d0ac7cd771fbe6d9e16e5b29d18ad57a20639d0c6a9e9a4d17e94e395b0045cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://kocarbonag.com/luutru/files/wixurukajawezapik.pdf In PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/3802532758.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/gisemavimidil.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/92838580176.pdfIn PDF document text
    • http://nessium.net/userfiles/file/najomalife.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/zejasuvane.pdfIn PDF document text
    • http://hoachattn.com/image/files/noroxazozijariraminol.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/fapolozizusixi.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/soludekarupan.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/bibivas.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/2810129214.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/zejoromavimapa.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/wilobopoxuxopa.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jikutixifuvifupirosegiga.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/vomelomuwadovobitatoferul.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/83374194696.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/zirufiretizedefetitat.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/nesozusibi.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/puxitikapig.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/masesoloxeve.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16177f40105563---23264347660.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/81866134931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=hair+accessories+clips+and+barrettesPDF 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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 19236 bytes
SHA-256: 94c95c5b3d566b29428290b9bebdc1674f61adcd24e4d241e8aebb82412b556e
font_01_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10640 bytes
SHA-256: 6279297dc44f697824036fa0a92d5d2ef94b1a084a3eab469a8f8ad7a2cb3ddd
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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