Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2128a29041706b6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 00:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50647f6e8a048f930477b0369f0fc3a0 SHA-1: 09833937273de8329a66825ef5f63e1e6cff8224 SHA-256: f2128a29041706b617c7deff5d3ac7d1c579d82fb1f92f26f0cd9d1c20620051
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm on disposable hosting, with numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://etabetasurvey.com/userfiles/files/28754234359.pdf In PDF document text
    • http://mrybalko.ru/files/20080511172.pdfIn PDF document text
    • https://medtek.vn/storage/file/34950539011.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/fafipobarapekuwinuviver.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/55753344538.pdfIn PDF document text
    • http://muszempilla.com/files/file/nilubur.pdfIn PDF document text
    • https://hobbypet.cz/files/file/witipadurulosasifusovedig.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/dolilezamizedaxufi.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/67324550711.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/54848403369.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/lurum.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/34834912422.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/66953459295.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/tinakukupakaxenutu.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/duxagemoberenubudalif.pdfIn PDF document text
    • https://maturana.cl/upload/file/xopuzi.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/98488648682.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/18b91e77b2c806950214551b39cd6016/kabisurewonutud.pdfIn PDF document text
    • https://grnca.org/img/files/files/67726861754.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1843b744a3adfe1fa77f080ea973c7e7/72529894281.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/folutumatid.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/39047836852.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/12421884767.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/soduzixejakokemumisaza.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/fudugodilisig.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/movinafunefugigekenapavil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=good+words+that+begin+with+cPDF 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_off0000b0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 15152 bytes
SHA-256: d919900a81843e77fe68d9dd61d5bc8944fdca15307e8ef29860c22a928d98d3
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 10868 bytes
SHA-256: 155538c271c44361215db469077d33fe634fc37b5762ca4bca880a661a064906
font_02_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1