Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26d00e62c53513e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 03:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 679d645490811279cc617d66e88799c4 SHA-1: 102c87ec1ce3de8e15caae75e00855e51cff1899 SHA-256: f26d00e62c53513eabc8a8ef10af88a092e0f2100f643e71830387b74e71ccf9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous URLs pointing to other PDF files hosted on various domains, some of which are potentially disposable. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights the nature of these links, suggesting an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://technocom.pl/editor/file/wifomukegobegisuzusumedaw.pdf In PDF document text
    • http://geodez.com/pliki/file/musunadoxozepozu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/17391842527.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/nasomaw.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/tetibedifelavevirewedej.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/88430823858.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kawilakavevakosadakewaxak.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xufonulofoge.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/mekafumowironege.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kewexorobi.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/basodegamapinulolesodo.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/43413164066.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/66231154917.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rezofujenetuvef.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090112162882.pdfIn PDF document text
    • http://yongqingtech.com/d/files/5219646763.pdfIn PDF document text
    • http://trieuduong.com/images/Download/pebumofevujubojizisufiwo.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/62623545501.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/57364028270.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/54674023565.pdfIn PDF document text
    • https://akvaguru.hu/user/file/dakuruzagikarujer.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/43153452710.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/70953899666.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/14362682284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ice+cream+mp4+song+downloadPDF 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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 18144 bytes
SHA-256: bf77195472013e382164cabee9131f7428aa6c035b2ba20ef257fcfe7f32c1fe
font_01_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 10780 bytes
SHA-256: fbdc3463c53a14ea97199b652b2d589bf64d61577604993c0dc80c2e08dfc78f

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