Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f828d5e3404ec9…

MALICIOUS

PDF

88.7 KB Created: 2021-09-23 05:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9716d7a6a16e71bd2491c4a6753c1bb SHA-1: 7a5b7869c912b3151a0897f4a39939038a6d2a67 SHA-256: 33f828d5e3404ec962f585aa0253d94f8db23fa3e8538c2c8bd733fad12671fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, including one pointing to 'synerhu.ru', suggesting it is part of a link farm or phishing campaign. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=intel+x86+emulator+accelerator PDF link annotation
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/kavavoranizupitemulidever.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a0ad503---mofimexurisusasil.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/vanij.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/73268090849.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/zozuvopobadoxowibexamip.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/sivegobuxulobirafi.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/20114180708.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/81244876862.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/35963241613.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/15553529929.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/memuxof.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/80376822968.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/39717028780.pdfIn PDF document text
    • https://magerp.org/upload/files/wuzom.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/73796464316.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/xulefofafokoralifofud.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991fdee1d2---getivudov.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fepawidufikudolodikir.pdfIn PDF document text
    • https://birotex.rs/images/files/38416223652.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/8744866687.pdfIn PDF document text
    • http://poliinc.com/upload/files/17402117021.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/67605250826.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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 19168 bytes
SHA-256: 8893e8f029f76595c08df852626206e1a09ce9e7b12a6a0d261991f08692e0ac
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C99 10660 bytes
SHA-256: 4a72411ab59424f985afa4010bb4c7d9e23fe3e00227dee36a1fad5ae6fe4ad5

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