Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5c62f731d70fda…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 11:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b969e72153ad1191bb766482dc4940c1 SHA-1: cac8331949d7e0e5bb96e755bd8d9249c62548fd SHA-256: de5c62f731d70fdaf0aae7f1766cca1fee53ff8959ac82721856cad7c895a8a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous links pointing to other PDF files on distinct domains. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malware distribution scheme, likely involving embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cordovajewelry.com/images/file/bomedanivuwimiwo.pdf In PDF document text
    • https://pensiuneaselina.ro/userfiles/file/pubajivapevezut.pdfIn PDF document text
    • http://robedecreateur.com/img/files/pakanelaxatejojegigu.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/regutan.pdfIn PDF document text
    • https://funke.be/data/file/35325747724.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449c6f2f08f---wisoligelumaz.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/boratofew.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/11011302326.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fugubejevamosumotimujol.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/paluruvakunu.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/78032428328.pdfIn PDF document text
    • http://baove24h.org/upload/files/20072101863.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/84575074377.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/babafamom.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/92837808093.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/44545853267.pdfIn PDF document text
    • http://suurelepa.ee/data/file/vavazukijis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6617aaf24---felekofuxagopukak.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/51045943282.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/paxupusezivap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=audio+datei+schneiden+androidPDF 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_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 18860 bytes
SHA-256: ff444a79ce71f054356a559db14249467ee6bbd9e17ee1bc4da5b191909e0633
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 10500 bytes
SHA-256: 10739d00794e6fea055fa564fe898dc168a537d59fab69f54195afa3aec1cbd9

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