Malicious PDF — malware analysis report

Static analysis result for SHA-256 a968d53bb22ac798…

MALICIOUS

PDF

73.8 KB Created: 2021-09-23 01:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2439125c635c29e938e44a4e91fab850 SHA-1: ad3d8d76b3ca51ebdcb20482696dcf2d19332b63 SHA-256: a968d53bb22ac798ffd1dcad77a4f6759eb1b2d3caaa259aa1b166af0c279297
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs, many pointing to potentially disposable domains, suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.logistiekverbeteren.nl/ckfinder/userfiles/files/72944872639.pdf In PDF document text
    • http://secureyun.cn/uploadfile/file///2021090907564350.pdfIn PDF document text
    • http://fohow77.ru/upload/file/nujitotebetopuz.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/dagodikovamudivokamud.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/modekobiw.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rasusewuvebodida.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/bipiduziboluxu.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/89274525580.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/pitalisuzuteki.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/feporajizoxobepibif.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/retijadipafaxedirib.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/fokizugonatex.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/jowemofujemusazosakoro.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/10102308199.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/19372011202.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/29922603239.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/1051896758.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/9189374764.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/90597178935.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/labarugo.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/gujomolixefugefo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a88aa7ab266442fe84fd21cff63feba/soguzuwov.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/56156361722.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/42304131416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=savita+bhabhi+application+for+androidPDF 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_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10696 bytes
SHA-256: b0bfb050a67b2f3ce6ec3dfbf7d0aa3cbc9e5196126762f4e6c80ed2d7e7a092
font_02_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 18564 bytes
SHA-256: 70f6b118261d4b92f1565e6345fb5a210cf9ac511307f5d756853526415a9ce1