Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8570225a13396ab…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 04:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 040fa3b423947d67e32b208fcf761aeb SHA-1: 35d9f5e6c0665fa391ff41193fa5b18ef8a68e62 SHA-256: a8570225a13396ab0a2bfd2ecad7f1173220e8aeda75dd2536a1a64b55ff77d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=slingshot+stunt+driver+game PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/niwuxuve.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/riponejowowubotemejasewo.pdfIn PDF document text
    • http://surausa.com/uploads/files/62674182692.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/masabinizanadidos.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/4260006009.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/68237549018.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/pubajigizapojitomosure.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/leselurebagomuzuwa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/23059e6d045c4366c7fbaca14a294d9a/faroxidejomizezozeve.pdfIn PDF document text
    • http://slsnn.ru/content/files/49447568798.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/vaguxowem.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/lepegubixe.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/73239309028.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/fuladil.pdfIn PDF document text
    • https://dukupahit.com/contents/files/sidazujujolixorafexotifu.pdfIn PDF document text
    • https://mihalex.by/files/files/68763019826.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489083bd1f3---gewiraxosomej.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/58534275747.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/zedutarazamepa.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210912112402189748.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/besekixosonagebaxo.pdfIn PDF document text
    • http://tzsunup.com/upload/ruwox.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/tafiban.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/29915377988.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631901349.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 17260 bytes
SHA-256: b60ecdbf9108bc9da4e25dee28a666dbc0786aa642e8dbb6a5fb6ef5e1f768bf
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 10936 bytes
SHA-256: fb478e272aab86a84e350df57315c12cd5d450380508df63df61ad6f7b7484a4

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