Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33ba2c8768e9531…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 09:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7746a3943f37f31967e7d851c670479 SHA-1: ca410fdf95f1f44bf3975445541286dfbac061b6 SHA-256: f33ba2c8768e9531ca99d3048258a202517f65e0d34f32f8bc6874bff2c8518f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, suggests a phishing or malware distribution attempt. The primary URL, 'https://crysiq.ru/uplcv?utm_term=download+poweramp+full+version+gratis', indicates a lure for downloading software, likely a pretext for delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=download+poweramp+full+version+gratis PDF link annotation
    • http://mondoacquapiscine.com/userfiles/files/60095676441.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///56839992444.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keleko.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/sesumekifovisejakag.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/xakelonogoxefobe.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/17527966338.pdfIn PDF document text
    • https://buka.ru/sadm_files/gaturugog.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/navezefatonituf.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zovebawogejajasiximunub.pdfIn PDF document text
    • https://remini.hu/userfiles/file/77021697521.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/40564596398.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/woparifubanuruveben.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd2e527712---jefenitemekonubukot.pdfIn PDF document text
    • http://kmsenior.org/file/files/40294035036.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/lifobarukekasedozajab.pdfIn PDF document text
    • https://purefeeling8.com/data/file/62485267542.pdfIn PDF document text
    • https://network-italia.com/file/kivufuduma.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/85593151392.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/nizako.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/80303716124.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/74639280434.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/61459924402.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/4572458729.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/74591630147.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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 16908 bytes
SHA-256: a28e88abfa9b06737423c1c21d9e9c22fb127ee1b6f2484b4decd0713146aec1
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 11096 bytes
SHA-256: 2dd118a507b1b3a48dc4aa2f54fa2e5030ed5d5dd5f9fd6a08be9290af2914d3

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