Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d35b3cdc2bcb1…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 01:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 092f7ddcbc0329096fc9d58637983988 SHA-1: 456d6bd70fb4a960341038a3c3c3e9aa530f267e SHA-256: 4f0d35b3cdc2bcb17fdabf8c03d5070ff5e0926076100de4335f8f61322ee523
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms, a common technique for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the document as a link farm on disposable hosting, further supporting the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://etravelbox.com/scgtest/team-explore/uploads/files/zitodesopawuzijizuponinub.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/lufuratozodekakugubon.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/xeziri.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/lutemamidoke.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/nazusuziwekej.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/61039937380.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/jibufisowugilegomagisexuw.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suxurobanijifezawan.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161392a865fba2---vexefexumusubitiseg.pdfIn PDF document text
    • http://eternoohydro.com/d/files/puwokon.pdfIn PDF document text
    • https://kaisar168.com/contents/files/99907151242.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109052221516049.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/14518540153.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/49381003522.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cdcff8e65a67e54c0f43956021a4f539/41191058011.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/48898662022.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/68376606032.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/82565735846.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/larunaru.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/sezejilekagadorekatinej.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/nojujorazezuxatetozojor.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/289870163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=boxskin+free+skin+mlPDF 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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10364 bytes
SHA-256: 112e3d033b22329a2ba7c20cc0a2ec7ba0d8ea05ba2fd2cebc5d584a5ba4b6b0
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 18568 bytes
SHA-256: dbc1c12d1cffe94f3b3c6f89d18ca77e9a9e76c3f0f4a44064d7b26a59324549