Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c89c1ab1529be8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 15:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1148681da46defb3247d752745ee3776 SHA-1: 8579fce66334ea02edcccc17c9eb1c2b7886cb67 SHA-256: 22c89c1ab1529be86b33d4d6df5a31c04ead3e49511621dcaaa8877424808e5b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high 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 to deliver a secondary payload or phish users. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jiehuist.com/userfiles/files/78071635108.pdf In PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/xakupi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/46604972338.pdfIn PDF document text
    • https://eternalbliss.net/file/82293432097.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/57513230080.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/vamefebuxaxax.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/smkjh7nrv9dibbch18hd9h1247/guwaremulu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405af349564---95231144865.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/13933672651.pdfIn PDF document text
    • https://petala.gr/userfiles/file/xasabet.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/levazawejufoteredanipus.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/buwajasijobolajilej.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/jokikutepuno.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/55270562293.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/zofopifewugalegugavezi.pdfIn PDF document text
    • http://goldmustang.com/files/files/rakop.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/72683906886.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/89893762209.pdfIn PDF document text
    • https://heureka-cz.eu/files/wepawurix.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/26537169834.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/40359048449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=war+games+offline+apk+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 10916 bytes
SHA-256: 0fe894d1d22d523ea31e1c86f2d08905567bf41bb10dedb43d5b2127de4299bf
font_01_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16644 bytes
SHA-256: e45a5dcb8207cebc3dc70490a5bddada42098ab16a29f1ef420bf380891e608c
font_02_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.