Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a47abc6a5b8bb8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 09:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fa79acd67c4887eee1de6a8bf1dcbd2 SHA-1: b7f9d3e1a3297c7ca51e67cbe06f6e315bfc55cd SHA-256: e9a47abc6a5b8bb8f3159d2fbe0d8971a41630601b154e348b84c4cb45c1ac10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many of which are hosted on disposable domains and contain UTM parameters, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=android+apk+hack+mod PDF link annotation
    • http://nicolalazzarotto.com/userfiles/files/dosogavetijibedaraz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ac39e886bf8a8de5026906ef235f5a73/totajavarerugow.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nabupewedasanutebo.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/ludifa.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/panitedokupa.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/19319172791.pdfIn PDF document text
    • http://darec.sk/files/files/bizevezidaverafok.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/76383173483.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/lebafagirakixobitir.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/gojefezilazoroxemepenura.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/bekasonewolimasemed.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/norkecdbv2l6e5k81183av95b5/jeridufe.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/peduke.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/jozikelupemopi.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/52637921598.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/wofoj.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/47209014344.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109040452148678.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/57774472631.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gipogogagexapegedilamepiv.pdfIn PDF document text
    • http://dkind.net/userData/board/file/39680511730.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/jisapozuvivon.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_off0000bbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD6 16056 bytes
SHA-256: ca61a5e9bfd5f2162ed3ec10b757e107b22aec7be99767edea2596f9c082d137
font_01_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 10408 bytes
SHA-256: 823fcbb39ab4f5c83f5583a39d9bd2f36892e68c766ffba1f4d10fc7c09ada50
font_02_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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