Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6f27dd277193b5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 12:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: dea6781ad0cf84db8b7686bab7391b01 SHA-1: 8bc6f7d969aada8b7e5ee8d16665ffb86ddbbf94 SHA-256: 2b6f27dd277193b569f5942cad3f41bde0d5d436e71d58fcb7929baa15a21662
126 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dongciao.com/uploads/files/202109120348173237.pdf In PDF document text
    • http://sarkanyhajo.hu/files/file/72732153598.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bilapobapedefij.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/52357580254.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/wozamuzog.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pifixoro.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0i1cotctk83k13hhvskhk4v2d7/53259829726.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/bibuzuz.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/pazigumiwuwumaralur.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/fawegisajerikuxazekexi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161458f2a59b93---jakelanabenasitop.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/wetivakudotaxe.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/31210048907.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/gebamagesegowokikawebaso.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3b0c3ce27e28cacf71fe2dd61085a4e5/jujenugujomamo.pdfIn PDF document text
    • http://ge-mak.com/files/lutujukowosipizagedununo.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/60066905656.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/nezabajorijogerazu.pdfIn PDF document text
    • https://vleek.com/uploads/files/fozidujavusovug.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/60345342450.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202196112734.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/numugosubinevof.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/pixexupojem.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/84995157992.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/16860959165.pdfIn PDF document text
    • https://mahae.hu/files/files/26150938784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jj+sakurai+pdfPDF 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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 18216 bytes
SHA-256: cc5c09057175c05748b6d153fce4c8db77b07aaa19d3f526ba74a010fdd12cb3
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 10304 bytes
SHA-256: a3945663376c522fc569a3d7604794c3839621e3eb293f29592c1a6fb692e181