Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e342f50d849d8db…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 06:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 697565e0e060ddf337c504432f2540fa SHA-1: 28e5798ed4b9bddcaf16667fee199336e11c415d SHA-256: 4e342f50d849d8db466752c8c1c23aad2315f44f7dc6911b2fe3896f22f1dad8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external URIs suggests an attempt to download and execute a secondary payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a likely phishing or spamming campaign using link farms to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=moddroid+minecraft+java PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/67b03006635a3e977786544f0583eb6d/wovoxepilenesufit.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/lowov.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/movedixasaf.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sofawuxisozavapoge.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9igu6v3g660r1mg9kt4rnpo2ml/goxixapax.pdfIn PDF document text
    • http://vswet.ru/f/34692241187.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/nirasowiluladisom.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/pozidodokirilidupud.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/tokilidonudopuweje.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/70881600556.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/pilukisuxikameludike.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/6210881866.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/sojozefukem.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/82227063649.pdfIn PDF document text
    • https://podimercrm.com/img/files/loruvu.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/jadobelelumaxalolovobe.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lepijamupiledololazawole.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/fidoluvegofabedelo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/rezoxemupozo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/naberufusirawumaxi.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/19227900882.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-12/20210912055650590442.pdfIn PDF document text
    • https://atlantidegattico.it/file/38753083289.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_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 10612 bytes
SHA-256: fcc1c39c9a4403eaa2482aea9afd2494afbb09e670d95592f75d876921b43451
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16808 bytes
SHA-256: b4b5a16ed0b04257f46f63fc58158faf9fc490aa9843138b01bc289cf67a9766
font_02_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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