Malicious PDF — malware analysis report

Static analysis result for SHA-256 faac6150ae8e8031…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 08:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5f0a566ab009c5fb22771268e98ef75 SHA-1: 9ba951e0ee04f9e2e3697b61486e7405a3a82c72 SHA-256: faac6150ae8e80312238a7500f1b9850ed6798e07b9ab31c8acb90cf8bbd96d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, suggesting an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=best+voicemail+app+for+android+2021 PDF link annotation
    • http://piri-piri.pl/ckfinder/userfiles/files/32793815807.pdfIn PDF document text
    • http://wdnederland.nl/file/7518837688.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/xoroxepediwimekesuvefet.pdfIn PDF document text
    • http://scarpatti.com/files/jogexizilapejigutivupug.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/26850860102.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/86564194572.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/sulikuvida.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/lanelajoxifabodivokobob.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b692278d71---52924564254.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/53461883262.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/wegalaget.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/95166584145.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/69978287864.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/fivel.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/daloxubajuvuzedibi.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130948034096.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/83019482394.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/ruzas.pdfIn PDF document text
    • http://accronline.com/userfiles/file/noditilamutowomu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/41ceb1e4ad61ac87acb58504c23fc014/57716757935.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/viletevopo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/65094684974.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/rokumokafabes.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/sukemeramajemonur.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/gazazijowaxup.pdfIn PDF document text
    • 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 17736 bytes
SHA-256: abe5670e12ad49c315ce98a9e29d97ab200c189ebc5a19a3efd2c43c0521ae34
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 11192 bytes
SHA-256: 5462163d78444727375990f147a57de0cf6099fae2f5f8fd70437118775dce4c