Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9d57c21d3973b4…

MALICIOUS

PDF

105.8 KB Created: 2021-09-11 22:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 558bcb4449c8a29192a198cb4b3dad85 SHA-1: 8006f7f45c59cd8299773d17bd454839c55f2be9 SHA-256: 9e9d57c21d3973b4dbf719c9149ff4c551547df2d3d14095666a7dc2cf507a1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://www.pattyn360.com/upload/forum/files/zufofumomeromex.pdf In PDF document text
    • https://perfecthospitals.com/FCKeditor/file/92212111429.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/puwevitef.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/53500368723.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/daxolalosima.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/87965181426.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/30602674197.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec7143742---wenujifegedutibinupab.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109071804142804.pdfIn PDF document text
    • http://furniture83.com/upload/files/78885915470.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/92679404561.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/63841272076.pdfIn PDF document text
    • https://wittnebel.dk/file/67571659093.pdfIn PDF document text
    • http://runo34.ru/attachments/file/56482183954.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/9647588937.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dedubepikojosakogovorefe.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/witinijolezifuw.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/setuvutukedalezoxir.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/felululojupiv.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/miluw.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/44930430718.pdfIn PDF document text
    • http://chayka-svg.ru/files/41162964705.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/godalivuguzagafujegejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=japanese+font+for+android+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 28552 bytes
SHA-256: 15a8f5da6037c712696240a19f75e9a35eb6bc4aa02c6a8f36be8f3c1e208d8c
font_02_sfnt_off00016a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5B 10568 bytes
SHA-256: bfc36b2352a688234c8921286abf01725c43bdfcca1c4647caf259157ebe837c
font_03_sfnt_off000182a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A5 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7