Malicious PDF — malware analysis report

Static analysis result for SHA-256 825c031cbadf0914…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1c0ac1285b396dc89ce9f73a568084a3 SHA-1: 4d9f0917785895364a20502cd52024342925feb7 SHA-256: 825c031cbadf0914dce36cfa3681ea46cfe167092762ddf09f3ed520760059fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are structured as link farms on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a spearphishing attachment designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chcial.ru/uplcv?utm_term=the+secret+of+moon+castle+pdf PDF link annotation
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/pilemedolaxowetalapozupux.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/zimixodabifexefagugat.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/58574631901.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/190923466735.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1978715108613ada6e3bd11.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/47343939303.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/55799280032.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/86909473932.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/buwokir.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/pofipufuninipifozixo.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/purawalusiwom.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/82534221609.pdfIn PDF document text
    • http://asustainable.com/global/file/vitetumixo.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/55968206083.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/56514785521.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/kidoferejarunotafu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613788887b05d---59275397272.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/59730362466.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438e634c613---55580770686.pdfIn PDF document text
    • http://rhondachem.com/d/files/34284148115.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210925_E3241F82DBDDCF9B.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/25423852607.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/mezeza.pdfIn PDF document text
    • http://cmtsport.com/pliki/lafosonoz.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/15038875114.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/95179271117.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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 10756 bytes
SHA-256: fb9e8756e94f0cf1f03487943e1a657851be192dea7228d90e33ca1e56b28a7d
font_01_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 15244 bytes
SHA-256: fc800a848a0c8200698071789e1e24cea1cb093bb2e4937a2d860faf0e328210
font_02_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.