Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d3c360e46b607b…

MALICIOUS

PDF

84.8 KB Created: 2021-10-04 16:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd7b66aa85b99a029f9a9b6bf7bad741 SHA-1: be31019f07672aaaeff8691a3d99cab99cd1d77d SHA-256: 79d3c360e46b607be8dd630f094afd8f78bfca5d549d6f77ac131bf616836d58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rhuyscampingcar.fr/images/files/994894766.pdf In PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/17/lazekusulutenunitodima.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/mexipeta.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/84552504750.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/55232468262.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f46ebb366a---libat.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/dojoputekudit.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/16620937242.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/xugijenanapuwasu.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/65769971234.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/jowuwefiralufodoj.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/rojebijizo.pdfIn PDF document text
    • http://synphabase.ch/upload/file/2702014305.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/vepujugugimu.pdfIn PDF document text
    • https://grnca.org/img/files/files/67663292125.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/43340874750.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/doremegupubeguvalaxus.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/47994822206.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/fugomipaxorivi.pdfIn PDF document text
    • http://sun-eko.eu/files/file/tudufuv.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147b0efdffff---jutilolagomojufatafasin.pdfIn PDF document text
    • http://minhanh.com/files/68206180108.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/bajalok.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/93873743359.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/wazizutovitoravowejab.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210914141421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=diddling+yourself+meaningPDF 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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 10812 bytes
SHA-256: ebf6560eb981a270c9259731eb7b685d093ed37328438d17a3e1f57a7c9b6329
font_02_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 19188 bytes
SHA-256: b3a1eb5b8f4b6146ae9b56217d8fcd4c50e21cad69f1a99500e57d5fedcd78f1