Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35ea93996955d4e…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 09:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43c9a3bd7089f256ff6c2d87a07e6d18 SHA-1: 7c1d4fe54c1d9874bb544cfd8bdf17ba0ec4e87d SHA-256: f35ea93996955d4e3ddd0722be9870cbcb213382de5d98901d8e701db9845bab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pasted-radio.de/web/files/79843720496.pdf In PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/19084294110.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/dutilapadix.pdfIn PDF document text
    • https://cargotavio.ru/files/file/2329497248.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/jogesetux.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/fanerilozinakedibalit.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/10701680379.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/joxonapavowelutaxi.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/38763681926.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/nodazisewuradozosok.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/vuwejunadani.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/vowezuki.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/85002831833.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/kapifaz.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/91529567098.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140243cefa48---27751126690.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/93281450191.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/dufopuduw.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/sojogevatosasuxafinudusi.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/46985242958.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/87996868347.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/juboneloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tabular+form+in+pivot+tablePDF 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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16132 bytes
SHA-256: 3f550b8264142f76d988740f5924b7362a973434e08805ad81ffd12d9a7090c2
font_01_sfnt_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10620 bytes
SHA-256: 7cd05ba4542ab92925bd96babd0363ea1b86919b2383351cf77882af6dec5599

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