Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6fa8695d48b73d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 09:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2aad1b4a7c98b803220d096fffbe6727 SHA-1: b30d278c11681ee256855fd49081f9f08b8cff0d SHA-256: 9c6fa8695d48b73dfe5d6b1517f947430847c9447be9a111b4ce1a268ecc50da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://es21sys.com/userfiles/file/96810126456.pdf In PDF document text
    • https://oferta.lt/i/File/zujoxim.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/xatiwemimufamevizazig.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/98566644008.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/bimamumede.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210916042236.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/feloginiwilezatazagoxejag.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/47433589021.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/30313693897.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kivule.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/38631036174.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/mudurovekerafukenipaxo.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/36991963968.pdfIn PDF document text
    • https://proia.bg/userfiles/file/5859160414.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/34087018373.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/sudedaw.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/57182392887.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jilujufu.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/88492299018.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://lesura.net/userfiles/file/bedorubufegap.pdfIn PDF document text
    • http://sbairs.com/datas/files/kaguxilawi.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/vanedejipiwedoju.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/19211434988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mx+player+pro+apk+latest+version+free+downloadPDF 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_off0000baf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 17160 bytes
SHA-256: 43b6666e45df3c31d717d22671a0ddb0266febacc65b597ff02b24758a4a7c9d
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10944 bytes
SHA-256: 4a83cbdb0e11f5ca7a3633bf2ec302a4e5cf16fb318e28831ffad394d8ae72ba

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