Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba8f7e79e31535f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 10:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 570067a71f916f5cc45730a7c51578c0 SHA-1: eed69ab9eb0c283124537d476e6e178fff8620c9 SHA-256: bba8f7e79e31535fe461cedfade60ca674c1257c416969c197b4cb903b6f6538
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krcatikyonetimi.com/userfiles/file/60143825822.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/folavizulajenejugezugofa.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/wikerep.pdfIn PDF document text
    • http://northcity.rs/slike/files/50250965957.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/gigisejawuruwiv.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/21522199054.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/80742360203.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/31221938361.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/wadedaxojagofituxanejug.pdfIn PDF document text
    • https://noventa.cz/media/files/file/34365734659.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/sifejukekokunuwitujus.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/93929407846.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c99e3c11---mobetobuvevu.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210916_B21C31DD43D35A67.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/24121029311.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/52927319652.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/80906582965.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/kosojuxiz.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/55434432732.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/76446861492.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/60445544321.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/powunilufavekiwenas.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/tajojepivudemir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+the+mortal+kombat+movies+in+orderPDF 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_off0000ad96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD96 10792 bytes
SHA-256: de7f261cb0d873564a076e12121585b48b28d8b54df415b5608ca6f3310468b7
font_01_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 16076 bytes
SHA-256: f5aa17a3a248e7d9d0550ecda3c51927b653d28e8f846d3333ea2c8e6b258a77