Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca88924b62c4719…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 19:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20990687945dd470a6f6845a71e4794c SHA-1: 64fd39b09444d11592246a488aad21c71e26e741 SHA-256: 5ca88924b62c4719826a9fd0ffc9389b0e8ea7bd1149cfb24c1c14bd1b0d7ed0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to suspicious domains and are part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kanchanaspa.com/ckfinder/userfiles/files/supipirejo.pdf In PDF document text
    • http://sangjeom.com/userfiles/file///kamamuremevorutus.pdfIn PDF document text
    • https://buyafranchise.org/files/files/lomimibebikujupuze.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/88099628861.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/batuf.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/36436934751.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/xigetasesutiguvuwile.pdfIn PDF document text
    • http://i-dron.cz/data/file/vivavajalefed.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/panuwadoxadibajovapofar.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/xojujasabibiruzonit.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/81191646032.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/34197946039.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/fajepapozerisu.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/nesibogokukaw.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/dirin.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/3771569886.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70714334648.pdfIn PDF document text
    • http://oilspecchem.com/files/pemobez.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/10180247619.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/fureso.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/57876147357.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/pevogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+3+dot+menuPDF link annotation
    • 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_off0000c23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23F 17228 bytes
SHA-256: 3c7e98c95f440bef8220ca5181b004f817078938defedf615ed206a7749266fd
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 10284 bytes
SHA-256: 87438dd296518fb5fe88b6b976c0ed9efef3c2a53ec678254ca97cf9825101f4
font_02_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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