Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0c832f01c3bcf2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 09:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42f88deb04333aa4e575d0372c7597b7 SHA-1: faa868b640f234a78c481c57dba2e994bad62b6e SHA-256: da0c832f01c3bcf2292476d63464f8256c00cbef4dcef82c562113eb74f979ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple external URIs were found, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/14193638290.pdf In PDF document text
    • https://stealthwindow.tw/uploads/files/202109191247286401.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/pojudebaj.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/56477596905.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bac2f3d33---gexilanatosusitewedeto.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/jujabutak.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/3013522964.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/rejokilipinujimasemiwir.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kibimu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b5ac9a81---3214218766.pdfIn PDF document text
    • http://eternaseguros.net/files/files/39493078950.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/wesifidodeposu.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/jajax.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wenizobumasolojuzaduwix.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/2075863571.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/5658222950.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/bisototib.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///zoropozuguwu.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/lotijolupiloroju.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/20466761778.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gumefed.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/pekeropusen.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/52018061782.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/51770113748.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/vipanon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=d+day+game+obb+file+downloadPDF 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_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 18692 bytes
SHA-256: 843af90389ba4acfe94026fcee203e880e3d93671cfb8cce665c728dbfe4930e
font_01_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10672 bytes
SHA-256: dacc77e723c4205b1d8495b5933de6c6956e801d8b30c2c613bd37d4a3a09362
font_02_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1