Malicious PDF — malware analysis report

Static analysis result for SHA-256 7326218eacafebe5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 01:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3cd72303fcea8ae57b329e08e743211 SHA-1: a6c10c36d344328a3bd62aea820d03a3c036f6e5 SHA-256: 7326218eacafebe5f8efd551f3560fe3ffb9bc04e8d6ac2b6845d3b0e2f46378
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://philabc.ru/uplcv?utm_term=vellum+wallpaper+apk PDF link annotation
    • http://szm.hu/userfiles/file/vutitef.pdfIn PDF document text
    • https://tuinvandecruys.be/file/77136067550.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/kofimidonojiwigutaxunop.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/zabowibopipixalerupo.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muvamijojanezuso.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/53519850413.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/gasogepuwezatexofaxizavi.pdfIn PDF document text
    • https://pindimana.in/uploads/file/manijep.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xaxibesusakoxafufivipujo.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/ridogovop.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/44260049652.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/sidalesupazimelalafa.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/9015286293.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/59152428252.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/gegilegibunafosa.pdfIn PDF document text
    • http://dongphat.net/upload/files/xovilagudete.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/28976756514.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/wovobiporeroni.pdfIn PDF document text
    • http://12shio5.com/contents/files/26763497675.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/milotazabir.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132d310ce38a---nilam.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/dekedoz.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_off0000acfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFE 10080 bytes
SHA-256: e76f6cb3a95ed716aaf1eb527d54f527c360ff8d4dcbde70425c4e04aec5ded9
font_01_sfnt_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16988 bytes
SHA-256: 635f5416bd1f62320a170d6c5461cf2b0e8d077c985ad67491220a5945bdd7d8

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