Malicious PDF — malware analysis report

Static analysis result for SHA-256 418f91dec726de9b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-22 16:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30afa9f7aadcd7d4371c6db331b00f32 SHA-1: 11e9d20add19764466b7365385db5aaf318c7018 SHA-256: 418f91dec726de9b0f76f664753b6c2db6392430466c5d8437fb9ed5b5f5230c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://goldenteriyaki.com/uploads/files/liwugimefudatimulosat.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b626423c60d05eb40ffd74f27707b814/dafukerarowapavek.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/nexigodibowujam.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6f2de33fea5f4bd2b006445092955d79/87143231067.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/25267395878.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26450043808.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/70451847170.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/sujuwisewoxizetatisow.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jesorarinosaretu.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/wuwavobejobugelot.pdfIn PDF document text
    • http://fitviewer.com/files/file/fatakuviloxifujaxo.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/dovoxolodas.pdfIn PDF document text
    • http://licausi.it/userfiles/files/12576549185.pdfIn PDF document text
    • http://1855-4080.com/userfiles/file/6744772722.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/gisolexaxerubiza.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/5996691062.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/50112803143.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pevuzofexoginubawake.pdfIn PDF document text
    • http://packturf.fr/files/zofatiganu.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/pefajagixar.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/62920687750.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/59080385958.pdfIn PDF document text
    • http://martonelektro.hu/files/file/4996975613.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/womelurexurawuwuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pixelmator+for+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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 15524 bytes
SHA-256: 6ec1051a1631919f5116c614492d2e037fa7636ca92b212de240cb92af4ddac8
font_02_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 10448 bytes
SHA-256: 40f21345d49c5ce2743d601d9118cd33f3dea4f9a43419c279bda495047e137c