Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a5d95bf24bc914…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 17:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b3bb791624608f677c1c1f08d0f1b6a SHA-1: 5e6dac83c03ac7fcd1929734bb0ab95de08393b8 SHA-256: 89a5d95bf24bc914678ad59c3b69cb4331e11df40615ede59ae695a32bae1aec
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

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.
  • 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
  • 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://oniceh.ru/uplcv?utm_term=get+50+free+instagram+followers+trial PDF link annotation
    • https://cafesca.org/ckfinder/userfiles/files/poxuberamidoper.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/kigewubidigejilasakod.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/zimixewabasun.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61236737096.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/vivusezavowine.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/tumexutulemutag.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sepezeba.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/silijezufiliwapi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/82452788443.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/62324761836.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210917082020.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/52701427778.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914050536538841.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/82242872741.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tasadanenekopuxaw.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/53400965276.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/domegetozite.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/lubafiluvitatap.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317354054023.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/tadofumivasugevogukodar.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/varujawuxugirowuwiv.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dijoxutunaxujoboke.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210913031540.pdfIn PDF document text
    • http://secoinblock.com/upload/files/rixazufanujofujipivus.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 10940 bytes
SHA-256: b5897e846e2fd7fa0421b6442613581a8118ac7fc5a8e3213e30120f9d28b035
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 17252 bytes
SHA-256: 3b9459ab02c71f5d962678777d93f36aa92a04a1a451eadcc5aabd5e8aa17499

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