Malicious PDF — malware analysis report

Static analysis result for SHA-256 4742b4bd9f083177…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 22:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c18ba7bd29f1b979c1135e7c6198da34 SHA-1: 6f60c3e443fa4504f28dd5bc5fce3828f68b0c83 SHA-256: 4742b4bd9f0831771744a46a421619d0cbc2234823e01e16d448d30fdd9d8a5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially suspicious domains, suggests an attempt to redirect the user to malicious websites for phishing or further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://novahealthclinic.ca/userfiles/file/34725844683.pdf In PDF document text
    • https://tepihtrava.rs/files/wuzijunijeleroxobazen.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8daa510d---pedubokokijunukejokowak.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xitujoxarunolajuto.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/63549154030.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/vilotexaxuvalapidom.pdfIn PDF document text
    • http://hanifeugur.com/image/files/42591397666.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/ligivedesajabasanovafijuf.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/tasuwigixi.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19517346763.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/fopevulevupowiraken.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/94062558367.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/80831531653.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/doludepobovabegiteka.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37848876561.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f2c5075e1e43d5360155c055e0e8299/givatutonusuzeripi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/96823577930.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/mizikib.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/fonezuwaketolazawug.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jobesekuzebakigitizalina.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85549859463.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/26441921496.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/61196186494.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/158365329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+transfer+by+bluetoothPDF 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_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10648 bytes
SHA-256: 28e1808e43b66b25cc87a278cb0e9966474fd7a9f0b439ebfff275259e22ff3d
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16932 bytes
SHA-256: c6685272fd509c112aa78428086f4ddee7e687836a433bba0121a70c633a6dc2