Malicious PDF — malware analysis report

Static analysis result for SHA-256 04383e5873c1150a…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 10:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 100d958e314333c755594e8801c4e0ef SHA-1: a0e75b2a24e6bffcfbfdeeee8ba4f3a058aa41ce SHA-256: 04383e5873c1150a0be6d1d70b06e8130ab426a07a08a50ae5a9b85ce3384839
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, with many distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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 http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdf In PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/gofixedo.pdfIn PDF document text
    • http://starma.pl/files/file/polidim.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/59822740672.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikomalowetup.pdfIn PDF document text
    • https://buka.ru/sadm_files/8077345872.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/37929233209.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/11284805939.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/80764868446.pdfIn PDF document text
    • http://elma1.ru/!upload/files/19230986121.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/kinukapegukela.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zadapesexeberovokowaxizuf.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/faraxipifepimoxejufex.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/98861628166.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/43081837012.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2fe0e59fedc1433e5e71d5798bcf295/59621757229.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bawuwowevodetixof.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/32849889972.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/kabinebexexatosapuminefen.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/79509007347.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd8d442f5---mutuliwug.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/69414570787.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/zibenugetinulokewededa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=motorola+theme+appPDF link annotation
    • 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_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 10148 bytes
SHA-256: b602e8e7e47bb971e285a49450ca6af173cc9700577dbd07d25db7fe95b2e05b
font_01_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 22468 bytes
SHA-256: 08f999aad1496ec8343546584af8bdbf4ff29be47142e29332a086262d430e05