Malicious PDF — malware analysis report

Static analysis result for SHA-256 45464ce00bf8e5a2…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 16:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8e872bf61ca6c5ff3aba191e7978e35 SHA-1: a70d197ddbbfc1fe2b7e9d3778bbb7097932e2cf SHA-256: 45464ce00bf8e5a2f6ef487a29df4a3739d31a55d88aa46b672dfac3e79e2afd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://autoscuolepintozzi.it/userfiles/files/pubiwab.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/59865666449.pdfIn PDF document text
    • http://sungder.com/upload/jixakexuxenese.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/96298677012.pdfIn PDF document text
    • https://invision.buzyhub.com/files/91493797960.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/69009085714.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/dogoge.pdfIn PDF document text
    • http://weldingplaza.com/files/file/46765581315.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/debizigagitaga.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/82942067445.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a914fb4051---dafurisuvapeverajubuk.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rufelovegameduv.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/32194503731.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/47434650236.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gapab.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/gibupamijigeponikolava.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/98543469756.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/84900672952.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eadbf1219b---80953964993.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/duxazerejofevunukawa.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pivavoxafofu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210902184657.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/rarukulurizoragubal.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/wotexisedap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=omnisphere+full+crackPDF 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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 17640 bytes
SHA-256: f7d45d4ee7c51cad641f9b5481cb0748421981b47dcea56e345254e22a9b1249
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10744 bytes
SHA-256: df95e0dff26015e2422ee61c03e3a2be88065decb05b0a8cc9fac3119bddee37
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1