Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18bdaee8e6f8591…

MALICIOUS

PDF

90.4 KB Created: 2021-09-11 17:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d397ab67e8b51440c924ac8232098696 SHA-1: a3d83d289f35c8da4953d5bf60a00acc995af487 SHA-256: d18bdaee8e6f859111d5db06b73a06bff16aabab8fe4169ebc18231f77c5024e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=badrinath+ki+dulhania+full+movie PDF link annotation
    • https://olivier-daulte.com/ckfinder/userfiles/files/wabobotat.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h9tk8ihvevdct0rmes24gi0bf5/47137911769.pdfIn PDF document text
    • http://grimastone.ru/files/25174105661.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/59506594018.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/8170050905.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gogoxofuvatufusa.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/8332576405.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/sukalivizavokironize.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/bizeluvuma.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af92c6e43d---soxazeweran.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/malopasumofusibiwataduzuj.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/46109284804.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/nakupalobi.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/mavunumasale.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/baxufuvurosa.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/40805507888.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/nopexe.pdfIn PDF document text
    • http://orderkai.com/uploads/files/71927375518.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/33747469257.pdfIn PDF document text
    • http://carszana.com/image/upload/File/nanogezaxupawedek.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/87183766485.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10764 bytes
SHA-256: 4110c1f2f6690624f0cbc5e556e43f18871368c83c6b85372eee3b439495d792
font_01_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 19132 bytes
SHA-256: c8238ed1e3c7b745be18d4ceacea2eeccbf3223e673251268a54a846e75d61a9

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