Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45234fe24829259…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 19:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b0a01111f45ec7b1122c4decb6bd332 SHA-1: 25b0ac7fb6d866b08b2eacf4dce05d6c9d18a080 SHA-256: c45234fe24829259f09df0640709eaeea1aafb12673b8fe2df285e7c9d7f04f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=best+mp3+cutter+and+joiner+for+android PDF link annotation
    • http://hwangtosidae.com/userData/ebizro_board/file/fugefomifilovumi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/72887254432.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/gasigisupapanuguwipiluv.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/12882544328.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/xokosinikaw.pdfIn PDF document text
    • https://micsys.in/userfiles/file/gekolamigeputukivobu.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/tarazakonazatatokew.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/13460691898.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/xuxotosetorejilese.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce79408e1f---pakigutedo.pdfIn PDF document text
    • http://sun-eko.eu/files/file/65772849967.pdfIn PDF document text
    • http://yztools.com/images/upload/File/83535536871.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/1381175797.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/nufalezixifujunufidalonew.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/vaxur.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/lupow.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/boxeveludukomixuw.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/labaxuvul.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/36956504707.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/26137063255.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/kusaduberadonafexizegubo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///97040623597.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614602dd397d4---nabefajekavovugobe.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/80189731797.pdfIn PDF document text
    • 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 17676 bytes
SHA-256: 9d8ab7474e06223b84c098b0a165c9e1b05460c1893442b4f76e3a1d734bd25f
font_01_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 11188 bytes
SHA-256: 8b029168b418864f065a6de9fd3354b0a57d02aab8e13f7de0ffdd9a802d39ef
font_02_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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