Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5959576b65dfba…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 02:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b6ab3aae36d4210606ba1f489163b0b0 SHA-1: cce68aabd4e2b73f07242e6c253b16d062ec414a SHA-256: 7f5959576b65dfba7312b94d29f775cd444614614d3ef1568644291c86efad83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alpinashop.bg/files/8246853957.pdf In PDF document text
    • https://tuinvandecruys.be/file/64104859345.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/39597621146.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/jevexemebal.pdfIn PDF document text
    • http://corkpotters.com/images/53810026352.pdfIn PDF document text
    • http://airsoft1.ro/files/file/92887583458.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/berajesenurexijizez.pdfIn PDF document text
    • http://wernitznigg.at/files/42841895009.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/japinow.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/vowawegokemif.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/40677914693.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/78834355468.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fozeg.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/25117965842.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/76131930939.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/fijiwerabiku.pdfIn PDF document text
    • https://ms01bet.com/contents/files/gaxim.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/43104357120.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fareso.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/66843965304.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/xukikuvisikebigi.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/30690831879.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7347848235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+add+subtitles+to+video+in+mx+playerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 18324 bytes
SHA-256: 67fcd0f83431a4d1ccaf92b9018cd4b014bb8ef434e3e09d4a562c88e52c4fa4
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 11152 bytes
SHA-256: 4e4cfed6a40a1072745e337c5b24d023e8c986db789695337103c41c65b7c066

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