Malicious PDF — malware analysis report

Static analysis result for SHA-256 05031af3a319da05…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 13:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2432e1d9ad56e352fc0f7149905a39a8 SHA-1: aefd3e3e1dc13b374587a4efee2ebe0c21ad560b SHA-256: 05031af3a319da054f864f5fb30e9d9b0371b5d34ea8e853d3d8e52329f53aa6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

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://synerhu.ru/uplcv?utm_term=vlad+and+niki+run+game+download PDF link annotation
    • http://feach.ie/images/uploads/file/21451597052.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nupodabeve.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/femoguva.pdfIn PDF document text
    • http://eko-uklid.com/files/file/53880905627.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109091214328305.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/64052789054.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/fajaliripozumawoxewip.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/tatasome.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210916_242EF264C342C3A3.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/29471964884.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/28020859425.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/81495809584.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/bekifenavepejitajepifeno.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/sezadodeta.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/daletekebivafelawajebab.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/67587017114.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/nibekekiwan.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/tudokasiri.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/29978727036.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/39989134844.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/kipukibabope.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/18011321966.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/jososipinojeduma.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_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 10572 bytes
SHA-256: 8e74b7ab0d43d9e86de38a87414ab30e3c17cc0a9f25a1434e8414011eb3c224
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 17212 bytes
SHA-256: 1d881863ddb0482719abef51c63e47c0afa98cb51b103a6bd010151ce3a25e48
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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