Malicious PDF — malware analysis report

Static analysis result for SHA-256 b664dfac80f2900e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 10:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5680dd5b452acbd6c698d092d7a95e56 SHA-1: 4d676d997aea06edf308025a2e646bdef1aa7d4d SHA-256: b664dfac80f2900ea5e5063c0c90482cf327ce7048ebc3018cb8dea35228f145
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it is used to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=lord+of+the+rings+book+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bfdd8966---pedakafadajesosub.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/57291127153.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zuketaxaguvo.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912235707_yvsprj.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/74997134652.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/jesudujavitivoraf.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/remunelujovibafulid.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bivedotizububevi.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/mapafajirifejoroliwi.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/10708880318.pdfIn PDF document text
    • https://webhosting4.net/media/file/komovojidipebufame.pdfIn PDF document text
    • https://12shio3.com/contents/files/vazotufiliz.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210901032938.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tixifaje.pdfIn PDF document text
    • https://tckontrola.hr/files/95074523460.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/12339237148.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23666198704.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/15966223489.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/98831551488.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/83936540675.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/lusegujulodos.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/30567353994.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/nofusavarivujujovajete.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_off0000b45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45D 10908 bytes
SHA-256: 83268f374ca3c64a17e6b36588b6b1cc5f7d610682fd529ecccb2a48ed53e666
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 15068 bytes
SHA-256: 82ea6f2ce82bbb2de01b29389297b778a10152b0c1e2c9a6eecc7cef309c0fa0

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