Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb33e5d4ab75937…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 03:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e821b833141f32215b76ff24641beefd SHA-1: 04719939b8025cde6781af2649b08004ffc054fb SHA-256: ecb33e5d4ab759370d1259449d864199d3b342bce173d603a8f4717f42a34dae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which point to disposable hosting, suggesting a link farm or redirection mechanism to further malicious sites. The presence of embedded JavaScript and numerous external links indicates an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ismet.com.br/ckfinder/userfiles/files/togovakonesibewomex.pdf In PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/82034542015.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/fuparara.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/40136622809.pdfIn PDF document text
    • https://simorgh.it/uploads/file/96727525361.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/bimakaviwidufodelitov.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091007470873499.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f962c5f44---poxoketuwakix.pdfIn PDF document text
    • http://infosierra.es/images/editor/65050561186.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kefakesokodikituxu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613686cfc9def---74923109540.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zadosokojola.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/vugetelitu.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/46344334303.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/gedufonupurejopatunidet.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/kedizimonosizab.pdfIn PDF document text
    • http://rvhifi.cz/files/file/85619251836.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zejarawobaf.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/83514231350.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/43404618890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cute+small+bloxburg+housesPDF 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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 17904 bytes
SHA-256: 34c9f67854691dc7ce71a68487d5abbd05e383068a1a0eaf5b13b97246941995
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10732 bytes
SHA-256: 2b77b59891e804ac752d079851e947f70a68ba3a8895f9891506be5ae8a38e06

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