Malicious PDF — malware analysis report

Static analysis result for SHA-256 1983dad7d8548170…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 02:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2baeb5c799da726bd865ae23e4f9b3b4 SHA-1: 2f18125bf45060301ed0a4fe789448b5749bc543 SHA-256: 1983dad7d85481703c98fea866d77998ad5ec41d280d30dd6f937956f9188ca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.ftha.org/admin/ckfinder/userfiles/files/63918885605.pdf In PDF document text
    • http://foodchemsino.com/d/files/54233610438.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/sozesemuluzo.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/ganisiwetodebuxuv.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/xonenat.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/pawuxovezewenigepidezen.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/87709195836.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/sexidugas.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/50217375549.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/43989684998.pdfIn PDF document text
    • http://www.puhito.hu/uploads/72008536527.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jijulamiraxugug.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/numemesugevijijatobeve.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/893571676.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/zewotorojodikozefijesosig.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54232564884.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/67035900065.pdfIn PDF document text
    • http://gibisch.org/files/files/73520839329.pdfIn PDF document text
    • http://learningkey.org/userfiles/towax.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/2095334981.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/37012263996.pdfIn PDF document text
    • http://zzquansu.cn/d/files/mulidetatujomero.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109111528454063.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109140446292106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+4+android+fan+madePDF 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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 18060 bytes
SHA-256: 9fabf9ade8acccde5b0038f67af8065829857554dc3bd928bf3e25e85df3e09e
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10420 bytes
SHA-256: db69a93e88ed4027a5bae91e5b7e2a3f80b284dd080ee7cdc9eb01024b21a07e

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