Malicious PDF — malware analysis report

Static analysis result for SHA-256 571fd4af70e9e638…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 23:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a074800198090d74f1cd04a26cbdbcad SHA-1: 8123f7317ced8071a2a094749687c17a8ece032e SHA-256: 571fd4af70e9e63891172d7ef92a73fec1fcd325d22632d7ebd89e83d573c7f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://worldsocialistpartyindia.org/ckfinder/userfiles/files/ketirifisabugut.pdf In PDF document text
    • http://gs-metals.com/filespath/files/20210904113120.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/3091968000.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/26758753252.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/totajabexevoduwukali.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/51250561147.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9141d9d7b---vebikivuzupo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398874ab9c2---42901977925.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/kenepaguvuta.pdfIn PDF document text
    • http://skene.es/userfiles/file/8417360405.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/37743262854.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/16007265556.pdfIn PDF document text
    • http://mq-water.net/upload/tefevikawebozuv.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/1041154133.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/68074088181.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/fitirexu.pdfIn PDF document text
    • https://gameclub.by/uploads/files/39398965923.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/neril.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/25787672028.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/xubavog.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/79145418780.pdfIn PDF document text
    • https://777mto.com/contents/files/newavilojekub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wild+rift+eu+apkPDF 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_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 19396 bytes
SHA-256: b7e920f457439999ff5342406441ac69931d070556f0981a9b1629baa59e849d
font_01_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10284 bytes
SHA-256: 2e702472db61b9f3a8c90953f0998c5d81e854ae3a88d1738836209e98913f6a
font_02_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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