Malicious PDF — malware analysis report

Static analysis result for SHA-256 5754b451b5f53f2a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 13:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc3b7addf24b684ea02ca18b7848ce5e SHA-1: 20ea433cfcba6e2e6b8b03e3e921ac3a8452da1c SHA-256: 5754b451b5f53f2a36c3358dd91fdf69dcbb29a11d0c5a25a49e17514de0d03c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oilmachineydy.com/d/files/63145120057.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/tifofin.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/39934709310.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mimawugibinusugorixi.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/guvixubetorara.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/60507579811.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/palimo.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/dugiguge.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/leritewelusosubokij.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/72991110432.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/firajuros.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/68504309468.pdfIn PDF document text
    • http://goref.ru/files/file/72789757218.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/juxenogige.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1bvgtn88qfsvj4q537eu32ln8c/gekojomuvube.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161329297a7310---50737894904.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/25338546582.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/5710473076.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/77014325337.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/28104812818.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/30568418228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hdtv+ultimate+3.0+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_off0000af38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF38 10668 bytes
SHA-256: 4b6e6a4521eb651e30de8d7067a62be556071387ad5b5a9da17fd7ab66cd98b8
font_01_sfnt_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 17932 bytes
SHA-256: c8bb4305816ea7ff21e9c5773cfb92c762277c914b2c082a6b0b645228dd156f

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