Malicious PDF — malware analysis report

Static analysis result for SHA-256 da067e91d373cee4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 08:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0fd9b91975948852a7f4c2b8dbaf5cb4 SHA-1: 4d435d57fe064d316d188db22e7b970cc6548f8e SHA-256: da067e91d373cee48e952300ca463dac5791ae11d4e2b5b062d0df528ea4e869
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 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hearing-outlet.com/uploads/files/202109041055419157.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/444eb9bd71df442ac3d167fb1d689199/78750808481.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/91324177715.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/nivifidobelaxidusonaxaviz.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/89090089508.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/wisewatexomup.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jitupezegizosi.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/jarakakejizamuravegiziz.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/demavodilagibu.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/9818208636.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xokuxubozoxivodexifi.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/vafive.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sinebevitowupiworojib.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/45910814872.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sepepem.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/8440030048.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630711558.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/domike.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/rewurebasijubevi.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_3665BC7C3B91422F.pdfIn PDF document text
    • http://8njl.com/userfiles/files/70106189140.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/19268113948.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nosiwijufusinataf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=grand+truck+gamePDF 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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 10520 bytes
SHA-256: 3ac389bb3709fb15a2ca7368055118da37ca20cd861fa70323ebe8f426dc9f1f
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16428 bytes
SHA-256: e67ff23b9daabcfa700ed0b8bf71ccff11e7acbc58b1034ea14f957b72e02396

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