Malicious PDF — malware analysis report

Static analysis result for SHA-256 c833c3feff6b8d0f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f03acffe770575c97e2a04309e1552e SHA-1: 457d62b759b4b5a5aec18439645088cbcafa257e SHA-256: c833c3feff6b8d0fc0fc167a778066686ab9c2652837c7f6002d4201e5885fe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to unknown domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lazdynumokykla.lt/userfiles/file/jotudofakopawizuzoxag.pdf In PDF document text
    • http://les-dvorik.ru/userfiles/file/99889020159.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/kobevegamaxiz.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/14030735421.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/gixoredifofijuvebez.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/nebotoduxeni.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/871449269.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109032057014396.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/powefebemodisisoludemosi.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/37785334998.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/sopurebixide.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zakoli.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/74322821640.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146259b342fe---53124223584.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/21/39274315337.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/28969824615.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u5qkr98duq9mcaclv1r3v7m5ka/75701689018.pdfIn PDF document text
    • http://shopabrang.com/images/files/suwasi.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/11732652008.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/34577438190.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/96312756803.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/dukofaxo.pdfIn PDF document text
    • http://client.diffuse.info/files/45431970769.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/debaputokepisigubane.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/sesimobijodasi.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/pobokedumibolora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=john+gba+lite+rom+downloadPDF 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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 10744 bytes
SHA-256: d3f69cbd89f89775b0c5ab4ec4e3012a47f35237336069f6a1bee7db4b65a2b9
font_02_sfnt_off000116c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 18248 bytes
SHA-256: 5c23687dee95672cb1f5761df752ebaeb250ffed5fec9b149ffc12330adfc0af