Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a1abbe7fe2a6e9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 16:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41baf967ae09df506d1dcaaceb019f45 SHA-1: 03bad817ec20bfd2009db7d6fd757320745c04d0 SHA-256: b4a1abbe7fe2a6e9259f52d3871acee325e2fc9e175b04d9e6de16f91c3dd075
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=disable+microphone+android PDF link annotation
    • https://tempatpasang.com/contents/files/ripasajakofuwi.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908063257285419.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/72187454966.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/27921422859.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905002736.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/11611870674.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/gemukugax.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/fosugififikasa.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/supajarirexupedojowonolul.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdca715fa7---20964783910.pdfIn PDF document text
    • https://basisnomor.com/contents/files/73173293149.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210913135123.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/21653909500.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/timisafevajumilujo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/39282255609.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/rajelag.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/44490541170.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/72809046408.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/tubebowewal.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/71131096381.pdfIn PDF document text
    • http://apvn.info/userfiles/file/70633512713.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/78863872835.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/nulesososefurako.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/72832682708.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 17824 bytes
SHA-256: e3f2ac0c7506f421ab9a248ea0acc889ae06158ad1a1214af5f68874debdb0c7
font_02_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 10820 bytes
SHA-256: bb035669377dc7a9709a16f8c15a38f8b71de04cba995cdb6895ac09c17a1faf

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