Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fe1167fbdf2e90…

MALICIOUS

PDF

88.1 KB Created: 2021-09-14 09:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f64c895c8ac99a357e1966bb7f6b192f SHA-1: 6cf5d914c72e46f7eb0c0d89e22b6e46575e111f SHA-256: d5fe1167fbdf2e9060a50b51b388a6c9deb2bff980caf42b53486610ef17f9f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=civil+engineering+games+for+android PDF link annotation
    • https://linhquan-group.com/upload/ck/files/86567562502.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sokaziwixomafanefikozenar.pdfIn PDF document text
    • http://oodow.cn/upload/file/2109110107086548211i0h9w2hedrh.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gibivoxevibidiruxedoxeb.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/90866910219.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/42028587950.pdfIn PDF document text
    • https://novsport.com/content/File/76795871816.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/25205333849.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/66be4c2d13e1dd76baa369b4fae125d2/71717780796.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xudekuro.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/filetalatibu.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/22653093310.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/jizifodowoligujale.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/libini.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/dibopivaxerujevirado.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/kewufesotaveboxeg.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2a6a6a88---sokozuworatutuket.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/zixinodalegabime.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/54264325763.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/lupudo.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fodep.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zumakawutenatadizasipu.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wezuziwe.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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 10696 bytes
SHA-256: bb9aba2e283b67fdb4f78701ccb61856fa2cc30b33e41f0a5b90328200c97e3f
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 17384 bytes
SHA-256: 8de537336b1623f42e699132452b5fcf64b154f45b62f7709214bf2f67d869ad

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