Malicious PDF — malware analysis report

Static analysis result for SHA-256 2752e5aefbb549ce…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 09:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96715486ba4be338cc86181587d8663d SHA-1: a69e6b629455aeffb55829afdec10e6b66b7981c SHA-256: 2752e5aefbb549ce1e8b0e170d9ffb182ede70b37c100d82355a3c07946618c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://aligokdemir.com/resimler/files/74168035976.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wulixifajitugupu.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/78857061743.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/kexowemekodomepa.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/14157432424.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/rudamuxosixivaxo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/dibisikenibozozilu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/21530728025.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/58686987233.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/3873046248.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eca163e1dcbeb34948aeac9095360d65/tesikixel.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/2173820659.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a05e54def6a80f84cf5cddf0acca62a6/355144174.pdfIn PDF document text
    • http://schokofontaenen.de/idata/80126175566.pdfIn PDF document text
    • http://skncn.com/u/files/pawimu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/tazudujelepelojuziremup.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/22302415269.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/pazivavem.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xamazedukedogajejinatam.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tufaweruri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+apk+installPDF 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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 17420 bytes
SHA-256: 3b7099fc67538c27effc249cb6ce698bbd9464262a4a029b053b30ac8c4e6fe7
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 10092 bytes
SHA-256: e24a299b7cf975d8b54ea35e4324fc3ebeaf8bf2bd0941aaf825d5c91bfec89d

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