Malicious PDF — malware analysis report

Static analysis result for SHA-256 f427c2d3e437dc93…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 03:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd60b5440b45c50152da40fad7c041d7 SHA-1: 0b88773612e5568fd2d89e5080768a6fcd789916 SHA-256: f427c2d3e437dc93a8d085fd247db18b0e3533fdcd8c6d546be99ce5da5c1c2a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=underworld+football+manager+2+mod+apk PDF link annotation
    • http://ridendo.cz/files/file/juwod.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210919_55BCF691714224B6.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cbb48d40---segivevagomukoguzejuwo.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/41852203561.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/juluralarajanasag.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rizotugegozaxek.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/88619765717.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/giduligadesini.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/21049150222.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/73899699775.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/tokegapapiviw.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/99738943773.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/60602353870.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/17338055507.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/lomimegalutogaxamak.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/nured.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/lekovimovudujalizap.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/76120169713.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tefumedoru.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/89707419925.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/kemuruwibuduvaripoza.pdfIn PDF document text
    • http://fivelscope.net/fckimages/36319920977.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a76ae4b9613eea9306a8cd255669d06/75998172048.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/24294404124.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/94538445169.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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 11024 bytes
SHA-256: 48892a99c2b3c24adff800f426e332a21bbc37c8d4ba4adac2ed2fddf690b0eb
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 18872 bytes
SHA-256: b95a2686c42af57f77d205dab8028b525fbb061f245f9468370c032c86645ac8
font_02_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1