Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcdcd2c8ac5abe1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 14:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58968bd47ddfc3433c3e78d31c1db47c SHA-1: fb2faff00e43eea7b6a0b905bd23e88a7063d5f3 SHA-256: fdcdcd2c8ac5abe1e7bc04310f04c622184338ca9338526267d209773498602d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, many on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://kco.su/userfiles/file/sifutejubukatedonen.pdf In PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/nitoferakazemipubak.pdfIn PDF document text
    • https://qnzar.com/files/17120573340.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kaxiba.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210920121002.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/35026185305.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/powokedule.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/52037319847.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/38631415524.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/83296415706.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/larikaxa.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/mizifitosobuluwub.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/xalusabifavulunapenabisi.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57425590139.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/nirazigodidozibazufosezot.pdfIn PDF document text
    • http://coachhouse.info/assets/file/nukejovafunidonobuwog.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sarubuxelavisof.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f689593501acd495ece6e60e4835ea9e/16908482645.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/firexisifidavi.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/topezorowaxezefolupoj.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/80281763287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=victoria+2016+watch+onlinePDF 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_off0000aeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 18432 bytes
SHA-256: fbd60df1675b17af420f5bf30142c6edb29c78284186a7bdef3c1f3ccc62c88d
font_01_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 10676 bytes
SHA-256: 4b23b25adcd7496ebd406de7f0dac8d2b961734e5d300f392c106002e464aad6
font_02_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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