Malicious PDF — malware analysis report

Static analysis result for SHA-256 808215d051d20f71…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 04:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5841b8ca6db530d8aa76c59a740a721 SHA-1: f5594ff6bc19b13b085d6e27e42612a95becd126 SHA-256: 808215d051d20f712f816d86930a3497e9edd45d96617ad70dc094e3bcbfa2ef
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

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 https://crewmak.ru/uplcv?utm_term=how+to+change+default+package+installer+android PDF link annotation
    • http://krupongs.com/images/file/68479004683.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/51781046694.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4b98eb6d---bazon.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/nelireka.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210927065108.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109262138373524.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/vomopiv.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/tivanabelufitokufe.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xitoxumujagefa.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zesexelanonuluwoj.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/27052738385.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/455964563613b23d8db8cb.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/lawovuwujid.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/53860470332.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/1296618683.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/balirezozivakivuvasepega.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133345336431---zutaru.pdfIn PDF document text
    • http://webbuilders.com/files/file/93172011455.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/fepegemibabejomekawozivuj.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/61304478365.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/bafip.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tozitanezifet.pdfIn PDF document text
    • https://braus.uz/images/shared/file/10274840429.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/51714988607.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/52619322037.pdfIn PDF document text
    • 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_off0000b076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB076 11168 bytes
SHA-256: fac0eee871bc83839a6446bd241672e8058ea7a8fc9f471f6210927f5c569f57
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 15296 bytes
SHA-256: 387d3186aaa9516965765e478da61f6a4d20ce6dc8fd34d2b5d192d2eb1aed04