Malicious PDF — malware analysis report

Static analysis result for SHA-256 2853a55dfc264952…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 04:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8760e97449de1da3772473a9a393dc24 SHA-1: 4ff249a9a7d1989d4f4fd32a14b114b168c71161 SHA-256: 2853a55dfc264952f72a1355e9d2a7a8f6d7d83b34bc39f8c5ac84059005493d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=play+store+last+update PDF link annotation
    • http://hongdacable.com/d/files/widozixitugi.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/38575921066.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/kogag.pdfIn PDF document text
    • http://stisk.com/file/jukazodepuziz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///42579525159.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pifexifuzumi.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/66845307410.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/nanilawoxixegeme.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/1131129220.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/98274973888.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/pewojaritosozuzopesu.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/53530347099.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/85883518764.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/legubofifosexena.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/59422807416.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/wugesara.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/zijoguviwesu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/jilataxum.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/38890657195.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf38e46f7---limajedobezikagi.pdfIn PDF document text
    • https://naves.cz/res/file/pavuto.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/83473654834.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/duxaxufiwinejizatitonagam.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_off0000b076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB076 10404 bytes
SHA-256: 37b0b4e230e550df5a66bf135af25cc10e6fe25b98674ba8f884b29c7354204a
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 14804 bytes
SHA-256: 107a838ea5bed50f866654690c7128a8600f07554a6101c36e025eb7f5d4ace6

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