Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5bbeaebb612dc8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 04:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f8ca7567c5cc0b02ade3e564b67dc00 SHA-1: 8c21469a2e1789f234e92d23bdc1e356e730d306 SHA-256: 4c5bbeaebb612dc8c1b2b684cb97dc758a602fa2ce53050ea6d1033ca45dacf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://harrodsrentacar.com/public_html/userfiles/file/saruf.pdf In PDF document text
    • http://aviatechinform.ru/sadm_files/tadipejolifutiwelap.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kesoxilibinad.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/l1tqsp1vh3va0a9jb27pjso2rh/652333292.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/96372118141.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/penemujogoditomuf.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/pikilidugusawabivuva.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/rufumivojajeliwatoweto.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/muzuxipe.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/14343969.pdfIn PDF document text
    • http://kalikraft.com/images/file/86732717511.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/tobizivasib.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/bivujupazukifugux.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wusadezemomafeluz.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905001027.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/6187996046.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2f32f2de---38109788067.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/8777981440.pdfIn PDF document text
    • https://yasacompany.com/upload/files/junewikaguxu.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/lavulelemibuja.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/44932260997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+movie+box+pro+for+androidPDF 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_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10788 bytes
SHA-256: c9662f6078e4441cc8af88c0f317f34121dd7e27714f87d506a9d4ade17db24a
font_02_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 17680 bytes
SHA-256: cf52700246444a22915229fd786ad1db11081970ef33524581c24529011b8bfd

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