Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c98b8ce6db97cf…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 22:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb34ea1efbf5e90c2753560a6e7bba55 SHA-1: 3d433d7423005de66dc23f370f4fe15208d10727 SHA-256: 08c98b8ce6db97cf9605d57b83714fe3c52698d5319a27f1ff515c599bd0a4c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=get+iphone+contacts+on+android PDF link annotation
    • http://files.ibiza-ferien.de/file/53021524982.pdfIn PDF document text
    • https://apra.pl/files/file/lavuvupefewokotedodop.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52196270546.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/30571810181.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/rifet.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/netijilakuror.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/piluzirobuxokopede.pdfIn PDF document text
    • http://riviera.az/userfiles/file/gisafobukogapuxojixujo.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/48250167951.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wilijalanojugekusamife.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/vujukuxek.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/94851940439.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/99770240832.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/67057226986.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/79980550680.pdfIn PDF document text
    • https://nada70.org/userfiles/file/nekubizivakuzelasutex.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/tikanisorumada.pdfIn PDF document text
    • http://www.siposferenc.hu/html/losedowi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c4d644adab1e9017ad729386212ab36d/juzolurezurilimuvusipoje.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/43001910729.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/33029534189.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dd19c38d---30527759628.pdfIn PDF document text
    • https://arerp.kr/data/file///fizuvodis.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_off0000c55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10604 bytes
SHA-256: b759ce25795796217c43f80504426e0dc178266e7fb58d5adce51528d954c1e8
font_02_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 17524 bytes
SHA-256: 57cf9db2ccb4df7fb6f4cfaeb72d123669b883112e2d45f06537672322900bd8

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