Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16adb7eed4ba5b6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-24 13:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97d2e0719752769b05628fab0ae0906e SHA-1: c9914c1e9c4ea949e7bcd675f1a80d6daf19a5f1 SHA-256: c16adb7eed4ba5b60424d7207e81412249c7c0558bfd5a760591d345622593ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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://catamma.ru/uplcv?utm_term=auto+launcher+apk PDF link annotation
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vibakoka.pdfIn PDF document text
    • http://mastervin.ru/files/file/jibimatomadotarolajijune.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sefebuxupo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/70593135602.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/36542883456.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/14303095016.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/zizeli.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/42434697753.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/fukamaxapepekokajon.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b2063683---finupuxegapanusi.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/vadimugonobiwab.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/18736134692.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d8fb51b757f48c1b8fe7afd94b6295d3/50357936034.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/wumolururemipalabi.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/sapopuroxutoxigezoxir.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/jobutifogamofirudiro.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/74472009592.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/99626817520.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/67629014216.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/91874920397.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/rewaga.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/77455182265.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/benutusuvewubuv.pdfIn PDF document text
    • https://akemi.ro/hirek/file/40618821139.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/43976279438.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161464cb5ab823---32260090056.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/48137426138.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF9 1852 bytes
SHA-256: dd65a598cc320bf8a047b5b95cd27ed38a7fb9de2ab85577ab688844a477305a
font_01_sfnt_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 24612 bytes
SHA-256: a31e3e893de3a31d1355861f619f1e5d86026067f77636dbe90f3de98ff1e65f
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16368 bytes
SHA-256: 4484988be2556000d0398633c05e00f865aae8955d1b2821a5fd01be80a620d2
font_03_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 10384 bytes
SHA-256: 67b8038fcdc56d0571244e9f8e5f055a380b03a65e3d23513b20a0ca4b7d843b
font_04_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1