Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6b1272ec6857b2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 22:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a94176e6ad970d7ed9f165daa31a84fa SHA-1: 8b44b5b5867047b6039279601a5f9e42197d1889 SHA-256: cc6b1272ec6857b2028537e9c3e423d028c6e4414fe6d1f5a7a0e753da80aa55
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high density of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=best+root+tools+for+android PDF link annotation
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/78860577668.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_B76753AAD6B970C5.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/19243450044.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/24460403414.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/lasizuga.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/29720185481.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/bevonul.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/bevoriridawajuba.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614919cc7193c---4951734229.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/menokovipoxerisojopibaw.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/47252415436.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/nusuxiwatedinolapoboze.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161420844252f3---vazurudekupolijikibon.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/42aff27a53464d9f91bad081b6211bf1/lofavobexowo.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/54178402404.pdfIn PDF document text
    • https://kawanmto.net/contents/files/debobelilisopon.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/43652937655.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetademopimogefelasi.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/55696867633.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210910231300.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/zulizawukamuz.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/nipalitopejavaxeza.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2557712569.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pitajewi.pdfIn PDF document text
    • 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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16336 bytes
SHA-256: 0f3c261d684157f6e7c40f846b7ae005ada8fe184358dd784fec5f01ade33c7c
font_02_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10400 bytes
SHA-256: 98255ce4b5ba047e19422057690c45d5dc75757b080f1b22817582a40c33aec5