Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f53242a88e36d1e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 09:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2385c1756a83e3f61d546d58590e8423 SHA-1: 54d23fc19a2cdf21e179e9fca1942200cc0097cb SHA-256: 9f53242a88e36d1eb3403d46b5218f8be92d0913e39f3e60929018ef2c7c0b9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting and are structured to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm characteristics suggests an attempt to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=iphone+11+pro+max+bangladesh+price PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce9baaf96---zivizabetirobujewow.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/85157144002.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/25825124780.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/dinamiwetukori.pdfIn PDF document text
    • http://simoncaulkin.com/images/55925914870.pdfIn PDF document text
    • http://ssp.by/var/upload/34492746790.pdfIn PDF document text
    • http://hongdacable.com/d/files/15291926672.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/liteba.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/duzijor.pdfIn PDF document text
    • http://scsytech.com/upload/files/japulo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/9287975437.pdfIn PDF document text
    • https://shevian.com/images/file/20615849324.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161456fa09fc22---dikotabepiko.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wejataj.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/60806995539.pdfIn PDF document text
    • http://malifer.hu/upload/file/18102963232.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/laroxojoruje.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/totinoxiwobigusux.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/90403715450.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/luvodajuw.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dipewizabu.pdfIn PDF document text
    • http://jar-ted.pl/file/4249463269.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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 11108 bytes
SHA-256: 78ee3c2ff6b8a6d45b227dc38cb595dcd93d51748a107d8f1e68f3256861689f
font_02_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 18184 bytes
SHA-256: 0eccb3cd655c06970ac2028a2b9e7d46768cae1c48b7d7c8308b875fa4e3229e

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