Malicious PDF — malware analysis report

Static analysis result for SHA-256 537243dece5ef1b4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 02:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72b495968fca901cb0231933000bc1a3 SHA-1: ec4ec653c439d7a4e17c7769428c280f50610172 SHA-256: 537243dece5ef1b46f7376570062121299aec28827ef95d4328efc14b863a08f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high concentration of links on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://testagenda1.myagenda.cz/pictures/editor/files/40926675055.pdf In PDF document text
    • http://mlsy.cz/images/file/files/95740184756.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jibufujuboba.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613951821207f---51889618021.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/dokidebunesigajutek.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gogawejamekoka.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/sigaveluxopuriw.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/7711592500.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/powopake.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630806876.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/15031104159.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/99991676497.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/18776523295.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/buzozabajatipudolovesi.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/43141040351.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sunoselerafuxawe.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/18704559819.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/60475373783.pdfIn PDF document text
    • http://tdbm.vn/upload/files/79432747395.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/63162762316.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613980112ebc9---rojuparesi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/915046833.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/84670319367.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133adc5acd7d---degiwefimidugebojubakota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+battery+app+for+android+2020PDF 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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 17084 bytes
SHA-256: 1736b765e58a552a7dfe93248d5a5335a29e7cacd7e5a6dd516c24f210f8fa2a
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 10996 bytes
SHA-256: b96275ab85017e32224846f8625db98e1d5a15f7b8cb2c025e0113549a5d2d3a