Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b94ecd030502f4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 22:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3c8db97d25e852b81ab9a23e2a5cb2e SHA-1: c1397747f48039953f3949e1fcb327df950d27e5 SHA-256: c4b94ecd030502f425f616065b033df29911e12a9d5474291bf74ed296327207
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, with several heuristics flagging it as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a URI pointing to a raw IP address suggests the document is designed to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=droidsheep+for+pc PDF link annotation
    • https://drlanda.hu/user/file/23267274564.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29185519084.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/dokozoradefoborimaxuzuviv.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f481792438---gemulipurukivokija.pdfPDF link annotation
    • https://lyubomiradineva.com/files/file/20463645893.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/50355197716.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/26233359866.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/pedalazovana.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76155899218.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vifolibivoma.pdfIn PDF document text
    • http://bankerz.in/qpic/files/zenatizu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903055751.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/fojuwitagaj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/872fc8988ebf25483b643aaa099a4897/resagonefa.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/5149478286.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/21754966072.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/totiku.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090920261073499.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/16725848300.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/jemifalusobuwutug.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/63855046185.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/zilowijexinutoxawevu.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/rumutameniso.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310e788ea31---67887349136.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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 10308 bytes
SHA-256: 03c0d1093d4c95771d2656cc397b5ef245bd781d5a04c2b415f86d5b43637356
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17748 bytes
SHA-256: c9e577c4d8d1a2a3fb3e5a7c80f864e006d63b4a179c9679615698edd02d9422
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1