Malicious PDF — malware analysis report

Static analysis result for SHA-256 9438e0fa89f62084…

MALICIOUS

PDF

74.8 KB Created: 2021-09-23 19:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43cc73010baeac21e0dc9b36d54382d8 SHA-1: 2b127326e9db2feb2a28c06d7bb020e6f93c18d5 SHA-256: 9438e0fa89f62084f7b58c4049829abd19e2683fbfe7f0c891735f49f67ae8e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=given+ep+1 PDF link annotation
    • http://miyozenemeryville.com/uploads/files/junuwus.pdfIn PDF document text
    • http://www.farimar.pt/imgs/uploads/zedetubixonimoku.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/linexivufe.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/39635143423.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/80170240108.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rizujes.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/187eecb56fde35b111871666d62ab999/45881303373.pdfIn PDF document text
    • http://skupka54.ru/upload/m/rejokofenijo.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/dalotatowolezenamax.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/16268762276.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/bifozewijoribeletem.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/20626108226.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tukub.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/91062409807.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/nejozuta.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/83242321210.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/99609659191.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/85332706299.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///11948740411.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/65334122070.pdfIn PDF document text
    • https://eclearusa.com/images/file/divakesuso.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/mivopovovuvezapogolud.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/87306709182.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/73271873526.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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 9708 bytes
SHA-256: fe68abc6694f6e30ae3287ec4cc50f1ce8d72877e2b36bf347d3b2f9af5ffe28
font_01_sfnt_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 17464 bytes
SHA-256: 4d2205d2a4fc809d40c48dc639d76ab68719003b8e4840d9c446656ef862d511
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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