Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb82d3e207d6fd7d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 04:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ad4a3191b2be27964950b90f38f8a3c SHA-1: 0d30dc4783cfb1615325913d56375864256c9e3d SHA-256: eb82d3e207d6fd7d71c618522d3e4d22e5a0afe719e0d5bd91d3094cd8dd4d0e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using disposable hosting for multiple links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 4

  • 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://zpkprzemysl.pl/ckfinder/userfiles/files/sizuvovasaxujupuvopotibob.pdf In PDF document text
    • http://asvpp.fr/pdf/82932618728.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/1250560614.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40896053910.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/45539084141.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/8179835825.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/55175180039.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/dipesabutujewabutewo.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/kananekojexefuwegelo.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/75122623796.pdfIn PDF document text
    • http://btfa.tw/upload/files/63832327566.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496c8f801c3---gafiguguna.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/59616276187.pdfIn PDF document text
    • http://lejuriste.ru/files/file/67642557274.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/unnvjghbsdd4d66829mqaadib5/99141727289.pdfIn PDF document text
    • http://uhorder.com/upload/files/16049747251.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/21606618562.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xezituxufosukoziguf.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/felitifirexuxifu.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/61000387211.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///32857621539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bad+piggies+download+pc+windows+7PDF 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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 17208 bytes
SHA-256: 1d072b562ebb8999b7fdd8f29f8d388d37e82915121524f3a362c2fe7250662e
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10680 bytes
SHA-256: f91456ebf2201849d18d378acce0c23737ebd3910dea80ead4a79fb156c5cb7e

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