Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8271b3e5e48f8a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 06:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e68575027148bc7f6ae39dbf653b507 SHA-1: 153e7a2d88e7fcc39db216ae5569cc47d9f35301 SHA-256: 5c8271b3e5e48f8aa0a67e9e4a3ab4ae352183c30ced7a66567cc500169bd52f
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=how+to+see+who+viewed+your+story PDF link annotation
    • http://www.dr.schure.net/ckfinder/userfiles/files/92236880081.pdfIn PDF document text
    • http://gro-felix.si/uploads/ramevilixajajimari.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zigufekavaviwelijijujene.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/78621766396.pdfIn PDF document text
    • https://majubesar.org/contents/files/10052807963.pdfIn PDF document text
    • http://holzbau-napetschnig.at/judiraduvatapenopunakawam.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/90749701080.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xusem.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/tosed.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307934b2f4d---49596478597.pdfIn PDF document text
    • http://marketingnews.fr/images/file/fumejutujifaleker.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/nosafipovesu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631841433990649467.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/bezetimurufozejolajoje.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/rugamekozezunovapam.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/78090556295.pdfIn PDF document text
    • http://keacg.com/upload/files/nuxug.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/74492345948.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce96df4ab.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/92933501091.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/jajasowawenululokafariz.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/11685548265.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/diroju.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nifugitubo.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 10388 bytes
SHA-256: 8a8ca2d8035ea21162fa0915a432d080414fce0c308cb15002da4078d768cb2b
font_02_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 19036 bytes
SHA-256: 6da1283b10b3e8267f24073f8ff44902ede2acd38d503a0a4106ce9c5f78511d

Open this report in the interactive analyzer, or submit your own file for analysis.