Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce069531d562c23…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 05:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ba197309e0290ba3faaf4aa3c0985f SHA-1: 26e26fbe455a624593f46c8ce598070525534248 SHA-256: 4ce069531d562c23ff02d9ff998e72eb649e449a4f5df47157caae1fad86d282
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme, where the document acts as a lure to a network of disposable domains. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=redmi+note+9+pro+recent+price+in+bangladesh
    • http://faithleader.org/js/ckfinder/userfiles/files/viromafitofabaxorizel.pdf
    • http://tgtech-auto.com/userfiles/file/furegubanurepo.pdf
    • https://milorem-service.ru/userfiles/file/23393956347.pdf
    • https://acrgruppe.de/userfiles/file/43138131979.pdf
    • http://video-cycling.de/files/file/vijapigelimagizirezado.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/449091022.pdf
    • https://dehayemek.net/upload/ckfinder/files/pojagiz.pdf
    • https://hondaotohaiphong.vn/upload/files/62895311573.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132f07d3fb59---xukobobejas.pdf
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/92848102206.pdf
    • http://thesecurityguardunion.ca/userfiles/files/guwasedevoki.pdf
    • http://strandedtattoo.net/file/gonepovoginuwurakagi.pdf
    • https://madeinstlucia.com/userfiles/files/52894240687.pdf
    • http://ziconiavip.com/uploadfck/file/jeketeso.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/16382214441.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce8e0d711---62783471481.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/77693495003.pdf
    • https://goldenlinejsc.com/userfiles/file/votobed.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/74261531950.pdf
    • http://obasekiestates.com/UserFiles/file/gasemotaxi.pdf
    • https://investincarpathians.eu/app/webroot/media/files/titibunal.pdf
    • http://imobiliariaimperio.com/files/files/tovolezexabevasobilug.pdf
    • http://backkwang.com/userData/board/file/89260318095.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin
46e590dbcc7bbc3555cfaf09f119c8a3af32169f84aaf2d31599684d67526169		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 11316 bytes
font_01_sfnt_off0000f68f.bin
82a791fd8d1bc01f23fcf9fc0cbc3862062155a039c9adc8e99a4296298305a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 19200 bytes
font_02_sfnt_off000128fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 16792 bytes

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