Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa289653b5f3f599…

MALICIOUS

PDF

87.0 KB Created: 2021-09-20 12:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e89147c324e53c983a389998a15c143 SHA-1: 3e677e825f1eec22886eec5e4b87cfb6b16b7958 SHA-256: fa289653b5f3f5992638ffc774ee78a35e2c23bffa5f6be860e394fc57399cfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=fast+and+furious+9+free+movie+download PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9ff4f1f3---newezivitefedanajufaxomug.pdfIn PDF document text
    • https://senegal4d.com/contents/files/33916627098.pdfIn PDF document text
    • http://c-six.it/userfiles/files/pubarovon.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/tiwojokalelaf.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/7357296069.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/butazapekutukojimos.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/kufagos.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/16581926365.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/93884665241.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gimedoxixe.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/13584984820.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/26512197365.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614421002e2fc---82285606003.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904093831.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/xenan.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/mutobovitegugojijoderab.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/67142605653.pdfIn PDF document text
    • http://weldingplaza.com/files/file/zirud.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/salimenudumatasulamuzux.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109020023004529.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/xamadow.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/duvavugusarekotez.pdfIn PDF document text
    • https://ptogel2.com/contents/files/85049460498.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/xorefawagafip.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 20256 bytes
SHA-256: 0bb27de333b683f388952c076619d70e6b98eb7e018c014b6b4ce7a33d491cf5
font_01_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 10912 bytes
SHA-256: 2b7c47342f49ba9e8aef4c94a7f058251976a6abf6321e9a95582d3a6010e730