Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5bbb21fe0707b2…

MALICIOUS

PDF

88.8 KB Created: 2021-09-11 18:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 824ea536c7c0cc1d29f6c1e0a3cb9aaf SHA-1: 318a3e9fe54b86e15844fef76b4b7757aacec1bd SHA-256: ff5bbb21fe0707b20e76d3d818b4452aae3299b4355ff5782f737a71141b4529
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=mulan+2020+watch+full+movie PDF link annotation
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/58723957967.pdfIn PDF document text
    • http://ceroki.com/image/files/52980900446.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/84388905454.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/49014503145.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/kulozulevadoxomusami.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91793587540.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/wipinomavave.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/3844779643.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/95368170892.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/zemop.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/96490407600.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zuxerorujivedevekak.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9f06f938---55557492171.pdfIn PDF document text
    • http://superazs.ru/images/news/file/42386900245.pdfIn PDF document text
    • http://chipgene.com/image/files/20210908_055847.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca36e0761---dejolesufugagunisa.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/rodumo.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/21049586780.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mawuzejo.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/tugokaweritegavimofikovom.pdfIn PDF document text
    • http://apex-architect.ru/images/file/72018421526.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/zeladefifumuk.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/61834136678.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/86707009829.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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 17788 bytes
SHA-256: 7908998adbce7d57ae4f339e867d0f4a909a29b53482d1a40ee9f2314ced7ed0
font_02_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 10820 bytes
SHA-256: b6815b866675b0db4ea2c58f2d6d1680e5f07440da0bfa6f1694c31be5abb433