Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b64fcf1345b45c3…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 09:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 776ea6e219b4c1e3b351cbb7d295fe6d SHA-1: cbff82e2bd8a87b4b3e05c3100fcb14c20ead3f8 SHA-256: 1b64fcf1345b45c395ce05938edfc3ace98ba89de8618de83861f36297731dae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure itself is also indicative of malicious intent, with duplicate object bodies and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=apps+to+watch+anime+on+firestick PDF link annotation
    • http://design-klasse.de/ckfinder/userfiles/files/10618145279.pdfIn PDF document text
    • http://zuszdounky.cz/files/fawemofokozu.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/70451147595.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/84358340403.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/reburujepu.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905082321476931.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69b026a1---6967323631.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138213f806f2---77123688781.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/risowejexanuvove.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/46326309039.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/64573731738.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/wadibabozebavibi.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/zudoxarubazozilux.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/wuvegowimafetidifobe.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/43978570115.pdfIn PDF document text
    • https://raljob.com/userfiles/file/95680943243.pdfIn PDF document text
    • http://lgassociates.in/uploads/27403199565.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/24412117768.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/pirewamuxiwaz.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/41845235789.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/mepativodajozegib.pdfIn PDF document text
    • https://producto.works/userfiles/file/1136979403.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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 10860 bytes
SHA-256: 99b47708edd6d7f103edd0d183b148ef2468606969dcc53393242f22d9824326
font_01_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 19400 bytes
SHA-256: 35bc45acea4898b0e6d00031e7631a50f3ee829a4d95f0fd51e1cf6053781f01
font_02_sfnt_off00013fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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