Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f2f461fb04067a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 20:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4310e2fd18638494ef7f24357f882669 SHA-1: d82cd817cfb61d15f9952ab54714780d121f95b2 SHA-256: 16f2f461fb04067a20caa64f4da45d2c21b674a0400167b095118569afe63265
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=metal+gear+solid+message+tone PDF link annotation
    • https://heritran.vn/uploads/news_file/raberabamamuziwopapop.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/xodixotujegozisevekok.pdfIn PDF document text
    • http://dhf-china.com/d/files/niwixejipodotanitivenewa.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913003715190144.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/70537144288.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/gupavakokukenasobami.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/99281267517.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/23366346007.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/zapasaz.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/91143223032.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/13810152748.pdfIn PDF document text
    • http://mq-water.net/upload/70364429019.pdfIn PDF document text
    • http://skisun.it/userfiles/files/15015608556.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zulude.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/5400603140.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/67668033534.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/72642556254.pdfIn PDF document text
    • http://birdwatching.sk/media/file/zilomagubibumuvesisimesoj.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/762da89daab654ac2cb82aa55d05fe69/38822612697.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/69178369253.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d56790278---31671955152.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/72739137118.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/8943165910.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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10584 bytes
SHA-256: 604bd7fa4ac62fd0aae5dae9b01cd8b8ca9ba9fadfd19369d08835684c3d35b2
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 17224 bytes
SHA-256: 91a2594bf924defa4914bbfd79fd3f8555fa420063c8f1cd7379e61ebd9651dd
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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