Malicious PDF — malware analysis report

Static analysis result for SHA-256 97948db3d04fae2b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 19:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8af552539c7887b0b5a6dde4a69e4997 SHA-1: 04e156d4c196a922db89cacaff608c9bd8d0c8bf SHA-256: 97948db3d04fae2b6961d45be79e5e76b5f66abc40b5b91b20a83619cdfd65dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://w-mill.jp/images/file/68460921102.pdf In PDF document text
    • https://loctra.net/userfiles/file/4356102296.pdfIn PDF document text
    • http://stevis.cz/files/file/17159302828.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/repokijasimusab.pdfIn PDF document text
    • http://nova-auto.com/upload/jubagazis.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/xeputoj.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jawanogefalirugedifotine.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/76818295850.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143327202724---xujerejidi.pdfIn PDF document text
    • https://sanagustin.cl/files/xugoxusikazomopivi.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/22805759911.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/22945573655.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/rexola.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/93256472082.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zemixagalanewiwes.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/48576296131.pdfIn PDF document text
    • http://net-marketing.hu/images/files/38270697861.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/mixagijuwumekefoxofotusu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/43605684155.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/51848779440.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631037667.pdfIn PDF document text
    • http://petrduchek.com/files/nugevimuxet.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/32774430239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+game+resolution+androidPDF 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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 18108 bytes
SHA-256: 194420c2036c04d7bb7ed06e8f3ccd69f364f89c62e1492edb4157729d65080b
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10992 bytes
SHA-256: 3dcd5850dc3b9532a510f42d63afe8027e15b248c544d753b2e0c8ab28c6998c

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