Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee5a7887e50536d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 11:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8b434c93c700e56a1b017ebfdb259ae SHA-1: 158797e22b971c58e1ad2508117fa912cc098a0f SHA-256: fee5a7887e50536d884748cd50c7aac65edbed2d6f167701220bf171f638b0b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many pointing to PDF files hosted on potentially disposable domains, suggesting a link farm or SEO poisoning attack. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/begos.pdf In PDF document text
    • https://its-bulgaria.bg/files/file/48573307158.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/244174460.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/mameguvurowujuzijijez.pdfIn PDF document text
    • http://greenld.com/userfiles/82423773074.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fac849c90---xawanozol.pdfIn PDF document text
    • https://capecoralliving.com/media/file/35686088245.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/65635601931.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dewelexufedelo.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/42015857474.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lofotezuzepozowazutanakuj.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zototasevijosasiva.pdfIn PDF document text
    • http://platcometals.com/images/file/kuguluzo.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/digawisami.pdfIn PDF document text
    • http://halaljones.com/uploads/files/84379177893.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/nobikisetubexukibenewub.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/88182504327.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/tibokofexiruwiwonimik.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614024074e75f---32916031423.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/tusuwitelozi.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/82185524737.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/65236040752.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/xalojoruto.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210917_C63CB6D51EF8BD57.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mobomarket+download+apkPDF 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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16940 bytes
SHA-256: e229c8b43135c5492d4e496654a00ea4a47b6f13d7fcaff7a333b87216a372dc
font_01_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 10604 bytes
SHA-256: 16933ad12be1306f371ec765029674a09546ce67fd5714617f35f992005f7fd1

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