Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dda32e822d2ce3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 13:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f528bd7a8b46416d452139cdee426258 SHA-1: 6bd0e0dec7c61c4f5cd55ccbcba2d8bbd3e4c096 SHA-256: 53dda32e822d2ce3dc8210a566ad34918cacd35978d31847a369b49cbe78046e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is used to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://syntra.pl/userfiles/file/relaxonisovogeguvogowa.pdf In PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/54621579777.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4olc9hl0j60rtnc2o3ikjt6b4/moxokadiboraroxejeno.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/dasaka.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/xuzaropuzatuzedaru.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/zuvijodaxerubagexakuwiv.pdfIn PDF document text
    • http://erpos.sk/data/files/morokazipexo.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/nojilebeviposoxo.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/guwejujoji.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/pojefomurepevepukalav.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vuxenijokebenanon.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/badumowuwabajakusav.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9a783629---14712965824.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/lenobawetovuru.pdfIn PDF document text
    • http://mweb.cz/images/file/wixebatavozudake.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/79456864766.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/60588477656.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/juzuzefaxajisiz.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/5124349972.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/50302567449.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090794533_858030053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+phone+app+lockPDF 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_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 17400 bytes
SHA-256: 852540db8c20d70cc577acb28618485f6997a20b4563be0a316f2ec6da71c2a8
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 10424 bytes
SHA-256: 8797d4a6345024b1d2c8202faf743b74fc1b609f7bb1b147364c786aab397dd3

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