Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21106b212819627…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 23:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e4c868f71aa03b12d74773fe12aeddc SHA-1: 59d0852a70e719e7b718b20c8e582ad71591c2fd SHA-256: c21106b21281962728ec94eaad766c7c34961f70dd88b22c5f0d0f782ca09748
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=let%27s+go+pikachu+gba+english+version+download PDF link annotation
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/30384325720.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/36268154685.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/wevuxo.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/6465179978.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/nelolojaroginexisuku.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/tudol.pdfIn PDF document text
    • https://beautydent.hu/editor_up/xipezulilivowapat.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/31625567915.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/vefajesogobenekulerulik.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/lawatodosuxitobegadet.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vexofuwokonit.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/sawalutuwodunofut.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/29068282863.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/52caf7b86654e8ef5ef35a6638fbd479/31260115725.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/bajamogasixilajezagu.pdfIn PDF document text
    • http://hkacca.com/userfiles/69784507548.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/gebonevawe.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///ritijixenupukegexoze.pdfIn PDF document text
    • http://rvhifi.cz/files/file/43281556075.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/30245206346.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc1b9410a9---85065090934.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_off0000bfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAE 19440 bytes
SHA-256: c5c977130275bbd495a32dc2aa068a72eaad0e21343401b849192e8a0ffc8aca
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 11268 bytes
SHA-256: beaf21741f1c98ef03bbd2a1ef85d8523605e65e27a27ac06a6620a1eff0af75
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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