Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35df270d6c35c4c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 23:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 916a3f4b444bfd115253ab43ddc05aa5 SHA-1: c813ec8ff6e2163422a41d79a074cd9d9e442917 SHA-256: d35df270d6c35c4c9666e50979d7f4861dd77a1b2499919afd07fa7479de24d0
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download process, contributing to the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://taikenplan.jp/ckfinder/userfiles/files/vaxunogesasovizudalajo.pdf In PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/tazilukemip.pdfIn PDF document text
    • http://immopolignano.lu/images/vuwigobakivakavenoja.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/98960328381.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/60881679563.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/mozuwetawovorevadinaku.pdfIn PDF document text
    • https://halkum.rs/files/lotom.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/30223199455.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/mobalufi.pdfIn PDF document text
    • http://falconltd.pl/cache/file/saselodiraki.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021325782.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/fofatiwowaji.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/74325464151.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/povelosolisiloxumo.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904221619414520.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/45493850110.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312498596559.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4f744d14---38938928648.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141d87f0857f---7681383111.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/80824559949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=utorrent+download+moviesPDF 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_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 10568 bytes
SHA-256: 15e26fc8cde9a3e6ce93bab2ec56ab3f6056a824747cf0846f13f5b34980c50f
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 17156 bytes
SHA-256: a0839b7a579aabcccf9981244e164b0d1bfa5f343533c30430e469c49e3141bc

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