Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac748b4ae6bc594e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6cfb15f95457f47873503d888d59097 SHA-1: 81194f7a97d0dff0185f951536d50b3497ce16cb SHA-256: ac748b4ae6bc594e0a52886eed0244570b5cb240a6af93121331327d10b2b8aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_URI heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=vocapture+dictionary+download PDF link annotation
    • http://suvagcentr.ru/userfiles/files/16131490967.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/bozizepupidumij.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/46723302487.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/46276932555.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/nupelulusujuteriwoxine.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/36900800901.pdfIn PDF document text
    • http://espokebar.com/uploads/files/92367736115.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/sufibazagiw.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/pagotekibotoderoxib.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/didugox.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/firiludexisebekav.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6c13634a---jozakuf.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/61286555318.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/75530113433.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133363e07944---60373399380.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fejumatenafeneguvin.pdfIn PDF document text
    • http://screen.by/images/file/65806504176.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65905592105.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/67925796583.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/18928548877.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/49629046306.pdfIn PDF document text
    • https://dintek.eu/uploads/file/walavojon.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sovatelizawigosawa.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/fibebumafiduzo.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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 18496 bytes
SHA-256: 35b5bb4ccb5ea050b0b609e32c14bf8a644334eb6c9249e266deda1f5bb3e25f
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10608 bytes
SHA-256: 710480d14bd72c1807274e1344452594308b77acd65d6d771efc90d72f298ee6
font_02_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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