Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c03e0ae8315ce9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 03:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d502f3daa64cad24e2c3352ba603062 SHA-1: 5742d686b854869710189aacaf3a2d955db40404 SHA-256: 79c03e0ae8315ce9caa52046449aa687b8283a0f2fefec7e86cd5954f08f18d8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, with a high heuristic score for being a link farm on disposable hosting. The document body is unreadable, but the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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.
  • 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://ticaproduce.com/ckfinder/userfiles/files/5047467544.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411d429c792---vimuxizibo.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/koselinewisavivuges.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/werenuxezirifobejude.pdfIn PDF document text
    • https://jjpremiers.com/files/3090560487.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/8790446172.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109020558241461.pdfIn PDF document text
    • https://lecachet.fr/docs/files/fetonobe.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/mitanuxeguresuxipadipep.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tusagowevisavojefudezis.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dad0cbb2---momibuvererinu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/67181282301.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xizaz.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/rugugobexofonemusos.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/japutiremifatebijabum.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/81899749993.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/nazemufewozodutu.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/16319007289.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/22918950501.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/72788914891.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zifemufodinuvewetaja.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/redosuruxewurujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+trash+folder+locationPDF 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_off0000bb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 10556 bytes
SHA-256: 1e0178beaf0c12a53833d3ec5104082d30acc73c9b8cfcd419bad23eb9408e37
font_01_sfnt_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 17420 bytes
SHA-256: 1f5ff57134e5eadd98d1ef15ad5ba72a6003f7575ea818ba1e812e30c4827b87