Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dee9eb982d861e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 10:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 157068d3d6b0337b6704ff8c4a958045 SHA-1: ba28299d0a1f011609d18e18a7092f4c1cba7ef5 SHA-256: 63dee9eb982d861edaff4d0698eeb4f3377f6722d17dfe3301a85c113e71ee50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=does+my+phone+have+a+sd+card PDF link annotation
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/58823044148.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/vepalerugomipabuwemuxidev.pdfIn PDF document text
    • http://charivne.info/images/file/jorilosonejuzarulalas.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210902_545EE1C6A1A12394.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/getorijiderowetiwodarig.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/83283517673.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/veziwiwibekovafa.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/401395579.pdfIn PDF document text
    • https://sim2007.com/files/7831353975.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/zenajelovaniwevisopar.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/22673379048.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e508765707---povas.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/84303847084.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/72754265580.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/67554595117.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/26137818950.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908233530914486.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/rawujujonojigakexowi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p6dg3mglrjsqj2fe6kndfr52tc/purekoxomivokekufuwaxug.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/72218414967.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/16577688956.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/15540210535.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/27764936729.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_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16948 bytes
SHA-256: d92c92ba744a8df1318e288ae089f3c29310b844b8bf28e7036fbcd4e61d0614
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 10724 bytes
SHA-256: 0757f07949aed240190c02fdbeeb44763cd3bb2d54a1d185db16f9faf80fd70d

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