Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c47b8340566790e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 15:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 243d03f1d70cbed1c172297f7a11713f SHA-1: 0973be39b8ee8c6de40b79382a51e7c2718b02dc SHA-256: 5c47b8340566790ef1576329798006d988ba7b79a1ceb9bb99c879a72dcced28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards a phishing attack that likely uses these links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=get+insta+unlimited+coins+apk+download PDF link annotation
    • https://dalnoboy.com/data/filestorage/upload/files/gatolodamebawuxaxuv.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/19930347676.pdfIn PDF document text
    • https://armenia4d.com/contents/files/72055750752.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7as2vc976k72tgde4l7ki5apq4/fatezutuk.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/11096766894.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jikero.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/63275664031.pdfIn PDF document text
    • http://clanlogging.com/userfiles/file/99339588790.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/95698932064.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/82620495833.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/kadevupopijijebepimipa.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/bijapa.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/dasutabaniduzexofozasixa.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/45835388042.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/79791788278.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/xexixenomuluwazavirido.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/89309221461.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/11025697023.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/36449951569.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/4409589028.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/63057555071.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210911063550333.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/mafugamarofamufevijaval.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/34695868428.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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10892 bytes
SHA-256: bc6b165d7b05a13a8d8ea18719bd2f116853a02f2dbaea7ca0fa4c1d671f715d
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 17768 bytes
SHA-256: 03b43383d1377d3a8c1006e235331f2558cee48236be229ad5a2cd119ffd6e25
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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