Malicious PDF — malware analysis report

Static analysis result for SHA-256 a577262d793bb4da…

MALICIOUS

PDF

75.4 KB Created: 2021-09-23 14:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7860615dc35b8351d88e958e3ed5c5e8 SHA-1: 077c61cbb77140e89d1cf5597a96592ac787f8b3 SHA-256: a577262d793bb4da87ff233b4473bd1be60e1b47e70e229163344b2880f00d2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=real+cricket+go+game+download+apk PDF link annotation
    • http://goksirkrupskimlyn.pl/img/upload/files/xetonavejumoforevok.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/rujusomutijaxoforidane.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/62316680646.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/66234868604.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/6829183093.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/29352750630.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/sebidixenofaveko.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/xovosewezuxegasit.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/42836056902.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/58373600820.pdfIn PDF document text
    • https://thietbigas.net/media/files/pavofizazezaxa.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/pasugofapabasoxuduzemek.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/vuwofetakepafavuxifofibu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/65662828844.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73678945541.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/nevidogujosavitunaxireku.pdfIn PDF document text
    • http://xfswchem.com/upload/files/modosudigezile.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/78232463848.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/011354347695.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/liwumawifigivugojufokuk.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/246a42ffe222465bcf16afe99df4e934/nexudalidetulejujomepojen.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/digefikogavape.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/56797456785.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/16217537264.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_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 10912 bytes
SHA-256: 173b4ad871b7886391c10d9ab03de7e44b6053875a7e90703a4575e6dfc871bb
font_01_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 17948 bytes
SHA-256: 017b70313da7f86b98b40a29c730f24e48bf7094ddc3892b8cdb26e4f36fdb4a
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1