Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7084834b685f25…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 09:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be736aba22241d49e63835dec4a4b5ab SHA-1: 1f8595a06b1fcc0306e1f53715d05df8f2f54610 SHA-256: 3b7084834b685f25044683f42246d143e080146865a4840a7e2f15609b192d5e
134 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, suggesting it's part of a link farm designed to redirect users to malicious content or download further stages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://huntic.ru/uplcv?utm_term=mixpad+apk+download PDF link annotation
    • http://ylplj.com/ckfinder/userfiles/files/woxomunodikikakidiruga.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/kuxorojasej.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/fenulewawa.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/19608848088.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161468a16a4755---48628731259.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/jazefugejepipewekujot.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-22-01-02-36.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/36302456746.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/mikelimenebosilonepo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/12005628029.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210915_EBA1EA2A6AE4543F.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/xafodatefefolojuzifidaxu.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/97215537221.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/kawezuzovakab.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210904044920.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/34987729883.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fuwajenuzevadiz.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/99812870855.pdfIn PDF document text
    • https://norservis.com/files/files/60473644527.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/xijoripoveguzuz.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/66424236589.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/rokogarof.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/58077113921.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_off0000ad63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC575 15348 bytes
SHA-256: 60e1e1ea784a9e8b2fa82872716b21198178dd19cc897cc597c34876638e259e
font_02_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10160 bytes
SHA-256: 55cfbde0d2ad648e0ebb44b74c02fe9d03ec41ebbb523be0fca2bd18a392bd77

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