Malicious PDF — malware analysis report

Static analysis result for SHA-256 af11aa883d977ffd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 18:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f592c7c95f783a7ac21a16c841e3104 SHA-1: 9935f5631139beb16114697efcf273b11f5639da SHA-256: af11aa883d977ffd4c370f172408a380b5348839662cfa85996e8588ea91dddf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. Heuristics indicate the PDF functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely related to the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=gta+sa+5kapks PDF link annotation
    • https://dalba.net/other_files/File/11895188573.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/22685127182.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/794ace33d93818eb53eda3991661c506/goxipupupupafenudefokofax.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/didetusizutebikeve.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/lusakufiweripofaxot.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/jesugogipetib.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///buvogul.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/37190995014.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/84489185145.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/3769874558.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/files/runorejenefapinujajuvewe.pdfIn PDF document text
    • http://reichspfarrer.sk/file/73402266538.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210921_135516.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/76314195214.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/113292152.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/movizez.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca2591c5ac---tajeriwijefuvufem.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/fidigutokazefa.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/14807612592.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/27451031390.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/56790700019.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/kujalurudoje.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/69045090777.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/88216266947.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/dekebirabukufeturib.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/76269087499.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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 9916 bytes
SHA-256: fecdc92ba7420918f4cef5f85b6f6b97a6261695384fb91780eb189dda167d7d
font_01_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 16600 bytes
SHA-256: 1d2fa99f0687b94831f94f52e01cb194b47bae04bf9bd519c2e83512b7a406df
font_02_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1