Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc84299e59ebd0d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 15:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a557cdb0c1ff54462129566698d30f31 SHA-1: ee925e11d8f95617b3664879de54f4bd35cfa6a7 SHA-256: abc84299e59ebd0d51ea363091817a772b3b226e0513a2e9b4fb0f8186be6cac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://corcreation.twbiz.me/data/fckeditor/files/20210911_045629.pdf In PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/1527930605.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/25527499939.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11367498569.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/94102602829.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///xojiluvorerasesadatola.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rujegupefover.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/763d3f5590afca80098fd1f76f991e5e/32225873347.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/69978287864.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/nitukujovokenikerow.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/35766917679.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/94217531178.pdfIn PDF document text
    • http://yongqingtech.com/d/files/veparinutazaxujopip.pdfIn PDF document text
    • http://telecycling.info/files/file/35821020968.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/99608890347.pdfIn PDF document text
    • http://futboltotal.net/images/files/62682801022.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/vugedevezar.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/41473263158.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57890664638.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/foduzuzepiw.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a4c6c108---65751962672.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zefobezosokiju.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210905230644_amFkaXRvZGlsZWRlZmlzZXBvcmVqb2ppZA==.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/94822345518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+zoom+app+on+android+tvPDF 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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 10456 bytes
SHA-256: bdd4c77f0d620b33918183fd35cfb1ff27bd10aa1f691d5aa02a16c88cf6204d
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 18516 bytes
SHA-256: 3507789d62266250ffb14ee6d60d7bfbf6375455538b00c00d60fe1bfaa98d52
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1