Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3558ee6b13a3e4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-08 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d329b84919c891035cdb460cb5942d5a SHA-1: d8c2f07de3d66fe73ea10ad2b758eb38f64f97c3 SHA-256: 4c3558ee6b13a3e46595b2074c2944818caeb065d95e8c6e85090c472cf82341
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a link farm or redirection mechanism. The PDF structure and the presence of embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crystaltrade.hu/data/file/wotexowubipewikinu.pdf In PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pixufosifupilabetejab.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/17266244422.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/66539478737.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907032939.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/31056353827.pdfIn PDF document text
    • http://compsult.net/userfiles/file/zimavuxepukuvopupejegavix.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/87268114838.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/33413435022.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/4030573625.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/niwakiluritiwigoxu.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/rijekuvisenusedome.pdfIn PDF document text
    • http://riversedgefm.com/files/file/61444311724.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/31704628472.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6a89a2b2---94096765207.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f2d65ec580f2cc0e8ca92184abbb0847/xowiralop.pdfIn PDF document text
    • http://iucecb.com/files/file/48933832627.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/nifozerefogugu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/88109945458.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/matogala.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gulaxanofeku.pdfIn PDF document text
    • http://furniture83.com/upload/files/kazenomekuvodal.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/85363362639.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/lugudijirelanuketa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=guru+granth+sahib+english+translation+pdfPDF 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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 18868 bytes
SHA-256: 4cbd9dd53e701c3b3cb5a6700e12906015601d34bd39fa6b440d67852d9b11a2
font_02_sfnt_off00013fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 11056 bytes
SHA-256: cfa68a17be9f1be8527e5b2ec002d6ec920905b0ed8a9f6029287d3c9599e27a

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