Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70c1f2e8451d485…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 19:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4b539a2bb0243880e0c663c2c98c42b SHA-1: a9e68029d14ae39c8ffff51b95fc46aff699197b SHA-256: c70c1f2e8451d485fcd44a38cb3d1b6df105ea7ec1ea5c925e5e5316d490f739
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79e148c11---sopezo.pdf
    • http://studiocalcinoni.com/userfiles/files/5604212836.pdf
    • http://noithatsah.com/webroot/img/files/gelaxugezodabipob.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/sawapodukikeligigojin.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/74661369938.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/51698025606.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/bonelobusogawejagus.pdf
    • http://ip-malkov.ru/uploads/files/58995166487.pdf
    • http://itemclinicchina.com/ckupload/files/posovekikuja.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/68044070206.pdf
    • http://freetds.net/userfiles/file/godonagawogivisederim.pdf
    • https://die-elke.de/cms/elke_page_files/file/pinasojoji.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/mitigoletekalumos.pdf
    • http://driscollandgibson.com/images/edit_images/file/pifivalapa.pdf
    • http://anoh.net/pds/userfiles/files/dajejunevenivo.pdf
    • http://savvyais.com/userfiles/file/41642464444.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161480b2b2fc4d---1787232543.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/fusamobupezojame.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/gemusolijotobulowulozita.pdf
    • http://share-world.tw/userfiles/file/pujalugepero.pdf
    • https://bulendengin.com/upload/ckfinder/files/jabuze.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/89332232916.pdf
    • https://yoimart.com/upload/file/20210912222830.pdf
    • http://circolonauticofavignana.it/userfiles/files/42000975200.pdf
    • http://interwork.sk/userfiles/file/terolonoz.pdf
    • http://atthaya.com/file_media/file_image/file/741175686.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=english+grammar+in+bengali+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_off0000b2aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 16792 bytes
font_01_sfnt_off0000cac1.bin
5477e17be82ac28def60f782741673c65a17a23f09208178136c27fca2ba463a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 10848 bytes
font_02_sfnt_off0000e30a.bin
2135787fd451203e343fb5e97ccc322a35507edf0100f8a0469d4c80e84db1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16132 bytes

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