Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8faedf66990415…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 23:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 06c2fddc9a2b0f591784918ea2a0f883 SHA-1: b08cd4aa2111e9dd76d4286d06d3bd98354ca12c SHA-256: 5d8faedf669904151b37f3262523cd409e312919ce84b5965f0563afecdd11a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

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://huntic.ru/uplcv?utm_term=cobra+free+fire+download PDF link annotation
    • http://sualpturizm.com/userfiles/file/21078066072.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/gikawiresowin.pdfIn PDF document text
    • http://4bx.pl/public/file/28854974380.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/najuvidegiliv.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/sizuduvurovokukegezadigi.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/18817419453.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/jebatajolivada.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/jovumida.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f762659c6e---25326468560.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/widilekitufog.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/11918476865.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/xigewodekakarigufa.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/nifizilibojejewitatesibe.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69512583667.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/34943408432.pdfIn PDF document text
    • https://aaaxxion.info/images/file/14804797213.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/18591903460.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210917232155.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/60166466992.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/23657055478.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/sikevukotukizefi.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/gobov.pdfIn PDF document text
    • https://o-dance.com/upload/files/zuwajezugejepo.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_off0000ae31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE31 17284 bytes
SHA-256: 001f114f03221039a2d774c474e2a8b86355340c94816754b06a51ea60e572ea
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10340 bytes
SHA-256: 74472432364a84dad8d0125cf901a7647cde56f880e12ca47d6dea390d766f9c

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