Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd423c040048a42f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 04:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 660a004c3705926fc62e418a0a08611b SHA-1: e38b43329d18bc258c7f26d490f4750277d76c96 SHA-256: cd423c040048a42f8f64275079f2e22140ca42f3ed1e84b0f9601d6d5c478986
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cottingham-group.com/cufiles/files/13862785454.pdf In PDF document text
    • http://nbc.ua/design/pic/file/73299631563.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kowoxef.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/nuxegezonunekiz.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/76665875080.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7e5960ab---dapawibovapazitus.pdfIn PDF document text
    • https://renteci.com/imagens/file/fuxifumoveribavejewavot.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vesuvivibe.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/worima.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bebonatemuj.pdfIn PDF document text
    • http://www.andreapondika.cz/file/relaganewebugupuduzefok.pdfIn PDF document text
    • http://baoveantam.org/upload/files/tazexixa.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/38108159258.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/mokisigaje.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/95300355383.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/sinajajiwewamejexewazomib.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/67786338188.pdfIn PDF document text
    • http://hmed.vn/upload/files/46903080237.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/43424795982.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/dunejo.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/62849221522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=master+full+movie+tamilrockersPDF 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_off0000b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 10644 bytes
SHA-256: da4e7d7099f31a612f6a5e7a67c481bcfddf394eb53f850e86d0c6086b192309
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 16516 bytes
SHA-256: f50e1cf78767cf040703fb563e2f326e6ccb6d0a200e0afa9b7f5cf2640c4b98

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