Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd75d044c9c59d8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 16:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e36967ca4763c8fbeb46790501fb976a SHA-1: dda9e3b2cd5aebaa677048ffad2210aebe5d18e0 SHA-256: 5bd75d044c9c59d85e4ee1fb2dc277be163c0cf065591f8e6066d4186431a369
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URIs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are consistent with techniques used to deliver malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=free+roaming+car+games+for+android PDF link annotation
    • https://rcot.org/userfiles/file/pidixapaboduzik.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/93845619197.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/69745511325.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/23490932278.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/8785152605.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/23574998833.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/66999374567.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/88449615995.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/dosonireloraxisafetonive.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/84406976269.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/50998897302.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/93063241776.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614228a8529a7---zejikibom.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bekapepib.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/89646018329.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/439952563.pdfIn PDF document text
    • https://priscar.com/documents/files/vekexupodozokegusu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84966364601.pdfIn PDF document text
    • http://carszana.com/image/upload/File/44677444559.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/77637234489.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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10652 bytes
SHA-256: d0bd43c74256688acb3b4c2ccbc7cb4c0baf5ea77e695a96e5f41f1e32707f0e
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 17608 bytes
SHA-256: cf709bce5064f8245a850e231ba3f214df7a036bfbead7cd69e35103cea7829e

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