Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c6af922f65ee0d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 00:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ba34c2d51e63005a3324f113925cf5e SHA-1: c381db8a56f1cb93d48c1c72cbfc491bbdc71d73 SHA-256: 20c6af922f65ee0d96967abb80ecc769f5f1250fe90b7635a7222d0df13bbfc2
126 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. The PDF contains numerous embedded links pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious purpose. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webinaris.biz/ckfinder/userfiles/publics/files/todebavedisodozowevesoto.pdf In PDF document text
    • http://ranjitabiswas.com/userfiles/files/32252454588.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/42743386490.pdfIn PDF document text
    • http://samtle.net/ckupload/files/jagasalufonetexigogofas.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/lubijifir.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/sutajipomulobilujidud.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca650d631---jotewigofolupeteteja.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/53658182561.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xumezirizivot.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xegupatigimokox.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/61804798999.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/rezatuferipon.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/pibumatulusubibusiwi.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wovinatinuselekino.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/98508363474.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/60471316066.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/62005523840.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/lemogiboletenifitotuk.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/fibed.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca669468a---fidesiluxedufosixuw.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dudotawogesepifuxusemila.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pewujidak.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210904_231952.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/77461964860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=choices+apk+hackPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 16948 bytes
SHA-256: 4c6c994434ba79bc90566b42170ae56da23f3f1b4317d6c18e27d0ed0444524d
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 10248 bytes
SHA-256: 79804c955b7ff5313e54ff30ef775996222bd9f6c235bd890f41ed275c99418e