Malicious PDF — malware analysis report

Static analysis result for SHA-256 696fd27e29813bfe…

MALICIOUS

PDF

68.6 KB Created: 2021-10-07 02:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4d9f07648f6a5caf1d58af9dc64585a SHA-1: ce504563cd80d528078916528d68e95438e3b139 SHA-256: 696fd27e29813bfeaf23db957d66ef0ea5e9e29d6638f87564e353838a2b2241
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, many pointing to PDF files on various domains, indicating a link farm or distribution network. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://geneolock.com/ckfinder/userfiles/files/wusisivajikawolojodewipa.pdf In PDF document text
    • http://eotp.info/sites/default/files/fck/file/62882420491.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/zaxiguzodojezuj.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/luwiw.pdfIn PDF document text
    • https://fobh.net/userfiles/files/44960709174.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/buxesikulusavaxuvinoxudom.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/wuzadokajupefilotop.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/65733510995.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/bofumuladozisi.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/wirogiwatavikilasoxaguwik.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/46641675927.pdfIn PDF document text
    • http://sayarbobinaj.com/file/gezudajefefa.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/92370778073.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468924110c7---33398410121.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jemujimebolob.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/timexuvo.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdfIn PDF document text
    • https://gameclub.by/uploads/files/48463701765.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/53206274452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+write+for+percussion+pdfPDF 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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 15236 bytes
SHA-256: c95b82b621816f1d3c9b5641984dbcfc4ced31faef7f7639606620721cf693b8
font_01_sfnt_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10584 bytes
SHA-256: fac03b49168516ab3bac69610202039552af19f1c0e7aa5a36915c860188f989

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