Malicious PDF — malware analysis report

Static analysis result for SHA-256 604f76752bc15db1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 13:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ecd512690b8dd2116d1f93154e9b693b SHA-1: 16f77531b33a66f0bdc762ba7b5f5b951f6f73ab SHA-256: 604f76752bc15db1a1d03c79aedd2b210f6a80e17fdced3ff19df68aa2d6bdc4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn likely leads to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://nhasachnguyenvancu.com/Images_upload/files/pololiwa.pdf In PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/modowukes.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/zukomaperigozor.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/megatefeviwojekajilip.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/ninikitefulupozaniduve.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/40920330047.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9fe32111ca5bd4cd29ab9229798892db/63171412332.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/51020635538.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/80346835829.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/jisofepimopozixaxira.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/kafosedikikesatafifexaj.pdfIn PDF document text
    • https://salwangurugram.com/files/99362023049.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/89353141914.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/lilavimazonepisexodapa.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/5199346527.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/nujof.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/44547798500.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/77edcdbeafc20a7009c04b6a82ae8f8f/17185707834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vevo+android+tv+apkPDF 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_off0000b5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 16708 bytes
SHA-256: 45c7de0e7906f2e9bd1887fe4cda41942945340fbbf26af7dee755986bd64770
font_02_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 10300 bytes
SHA-256: d84efa8226387f5a34099601f29514ad52aeb9a7a70bffa3c6eecf24c2315103

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