Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb55c51b5c1e516…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 09:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 267a1e3a0cb8555044498a643462115e SHA-1: c0455d9423469795ee019200c223d07bc0b3c0aa SHA-256: deb55c51b5c1e516a30017577aa428d8215323b394743f671d3fc43b1e022688
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous PDF links to obscure the ultimate malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, likely to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://ceraunavoltapizzeria.it/userfiles/files/54808290143.pdf In PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/18164072196.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/69661634314.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/rapudugixupavo.pdfIn PDF document text
    • http://cudicio.it/images/file/17335963284.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614699d05806c---29711235846.pdfIn PDF document text
    • https://cian.hr/userfiles/file/solekobokokerubus.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/kojipok.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/tewefafefuwoxumuluxoga.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/2460434660.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/44677524819.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zigilozakurezulirabek.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/23867911832.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/ropix.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/27311539456.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/dudufekumolapuzapevew.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/zazarakavepiwiv.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/42715477826.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wimixazerunibufopu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/ronikowijumafipumeve.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/faninosefezi.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091207413073499.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21163826357.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/foxozir.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/71564646935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=aplicacion+para+subrayar+pdf+androidPDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 18492 bytes
SHA-256: 07552e1b599a16a4ebfbd7517d3fb68975eb9a05aa854f2bddf629c91c526299
font_01_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 10716 bytes
SHA-256: 83f7c4ac17bdfc8d68e821fd597c3b2d2a0be186b53a7f14fed965984eb59b6b