Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911cecbfadd799d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 09:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d2e79ba30f9e49c53c544de8e8014fb SHA-1: 6fd2fa3d2fc1df54c44547cea09627b72024f94e SHA-256: 4911cecbfadd799ddf95e0a808c50adeb5c3708eed016a2983772489630d62f2
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a malicious document, likely used for phishing or to download further payloads. The presence of embedded JavaScript (T1059.007) and the exploitation of client vulnerabilities (T1203) are evident.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nileagriculturalindustries.com/file/98048914914.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/rewuloxazeroketo.pdfIn PDF document text
    • https://emenu.hu/editor_up/12196378066.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelubat.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/nejegude.pdfIn PDF document text
    • http://orenprom.com/img/account/file/57603244428.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8b452a6d---60531352132.pdfIn PDF document text
    • http://petrduchek.com/files/58450122036.pdfIn PDF document text
    • http://licausi.it/userfiles/files/gonosovogowopu.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/danaweruvojazuzep.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gojutomimifixirij.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pizibo.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/mirole.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/53300074797.pdfIn PDF document text
    • http://yulintimber.cn/d/files/pafuzajivodakojori.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xazotezunobupe.pdfPDF link annotation
    • https://imagebrandstudio.com/userfiles/file/pukok.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/75824095108.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/vedoxegebaripimixagufuf.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109091837526411.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/92837541290.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109041121491388.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/37770495058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unlock+an+iphone+11+proPDF 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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10624 bytes
SHA-256: 7f06bd9644ffd35f7261acee91b45a60302ed1645eefa6a0dc7d824bc653b1e4
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 18204 bytes
SHA-256: fb34be574e77acd936123b9725564f8ffe46b91317e4b2e9d797730f62e1e9ab