Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db9db9f90d210e3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 11:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48413c860280cfb9ff01069076ddac26 SHA-1: 4113759ef4b867dfdce3461902279cc7077aeb5f SHA-256: 6db9db9f90d210e34a7c0507dbd4d4d5f7f1cbe8c58acc51114cb2a0ec914929
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs. It also features a high number of external URIs pointing to a link farm, with one specific URL identified as a potential distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://youngdongtec.com/userfiles/file/tilefabimanozagaludu.pdf In PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/30850243951.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/64948750003.pdfIn PDF document text
    • https://invision.buzyhub.com/files/80615519330.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/83668868468.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e1fe93ffe45dff1bebd9524302524a4d/rerumaso.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/97541132772.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/wirasufa.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/86328962704.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/bizidomuzumo.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/19345352492.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/72357394279.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/87886658927.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bipefigusixesasuxiluzo.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/4537369150.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rosikizu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d9bd98b6---14275157770.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/wivutuxirixejalikira.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/91414660887.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/zigubig.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/2753989096.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/4878999018.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/6751412752.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/72871444857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=moto+x4+move+apps+to+sd+cardPDF 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_off0000c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC561 10672 bytes
SHA-256: 5db7a999a8476a8784d88e3ff25b717f08f9160c107667c50be85ba4904e4ae8
font_01_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16956 bytes
SHA-256: 25dc301f5892351118034933dfce6698c51d9bf6b70b2d258e9c36425f5a815d
font_02_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1