Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac608fe47b960bf…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 23:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c7374b2e84e5dbc0158e13dda0383e3 SHA-1: c96bc4580293c283688390d77c5eb237c696d448 SHA-256: 5ac608fe47b960bfa8fcc7add3de36306a57d224b1363dc7d61e47f2222704c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://archism.ru/uplcv?utm_term=how+to+plot+parabolas PDF link annotation
    • http://rund-sro.cz/UserFiles/File/10663580818.pdfIn PDF document text
    • http://camonetinternational.com/files/file/rufoxufo.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/rifidezumitenunukasedosun.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/13936464708.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/dufutilimekax.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/61353977398.pdfIn PDF document text
    • https://produse-zilan.ro/files/nosuti.pdfIn PDF document text
    • http://katela.net/userData/board/file/92419405692.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/nufukuzitulafolabuf.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613514beaadd4---wiponeviturara.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/roguzose.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/20240194257.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/sexazegupagi.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/86909765419.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/kusosusalifejorukuka.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/mubazudikukopav.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/74152175583.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/17925858786.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090945518_120664922.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/48201073647.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/veguvigejalure.pdfIn PDF document text
    • http://reichspfarrer.sk/file/11719180514.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gagivixofatatuwulojanowej.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_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 10136 bytes
SHA-256: fcf87f07b7935a1d308ace275e90a61a1f2520668a6eec32202f4cac3bfb9e6c
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 17668 bytes
SHA-256: 8b92d75a67fd4a0c88be0f5e9135bf721ab9a402c6fccf97492a760411673965
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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