Malicious PDF — malware analysis report

Static analysis result for SHA-256 432b4f0f1413f77b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 05:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d57b26d6a42372583cab6825e6e1078 SHA-1: 255a9bfb23e2340e47c6c349c08786d34108b95f SHA-256: 432b4f0f1413f77b73cd4d8d13ac70d5c94b4dab252fffa8adee81176706ad3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it's a link farm designed to redirect users to potentially malicious sites, as evidenced by the numerous unknown reputation URLs. The embedded JavaScript is likely used to facilitate these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alnadaoil.com/userfiles/file/juduraraw.pdf In PDF document text
    • https://immo-macedo.lu/userfiles/files/24212106682.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/nadopovupumofuvem.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/jaxup.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913051149.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/73825293958.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/14354252985.pdfIn PDF document text
    • https://digireg.cz/upload/nezakapewukukumunojixu.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/fokekonuparuxu.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/xagidogef.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/70174325842.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/17204383813.pdfIn PDF document text
    • http://kleiberit.ru/files/file/51114463248.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/50854306610.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vavorewirikizafokoxi.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/vinunuxaton.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/zadelin.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/84235108812.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905135632489.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/37682889668.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/60190321273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+lock+wifi+on+android+phonePDF 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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 17620 bytes
SHA-256: 29b37b1b5a9688542bd972c4a42c889a24aeced7dd4315623e6ae18d94f44e26
font_01_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 10720 bytes
SHA-256: f8b5905aa8f9bf35c556825afa32b75f95c4bb225201d5bdf02d3dd1aa57d404

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