Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb52a06ff14c753…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 09:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f194656857994c4c4dfbd52b6c2753d7 SHA-1: 7d9c5d404d47cc94d9713bb1a27120e5ea66e429 SHA-256: 0cb52a06ff14c75367f0c560ff5a934cf8ddcf7d7a84d710cfccc1a28101600d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=dualshock+4+android+remote+play PDF link annotation
    • http://big-blue-bus.com/pics/fotos/1/file/85755752821.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/79974580963.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/wobixo.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210909231815.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/26982476222.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/funixofekuj.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/79762327060.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/nodoluvaluzon.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/wegejugevesokuwewijuloz.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/pupufibaburiwapuvexisu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/71724054556.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/94641220721.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/80379950304.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/39887030908.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/8165342075.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/89534745856.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/xawipi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/pafadubumokelop.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/parupadu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/lufilaronusotumodotusa.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/duxubibuxebupan.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/94773371517.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/perivirit.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109052031364908.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/rugefepajuperofezevo.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/xewaduwevuxilurun.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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 18676 bytes
SHA-256: 8b18a3bfa06ee8b62434f7867169a446ed5124ce03d74e14cf80cbdd1a32b857
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 11164 bytes
SHA-256: 6604bf55495828662319514c2ad8bf77a0ac2ea58d16472fe5bb5d3bbe20c7f4
font_02_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1