Malicious PDF — malware analysis report

Static analysis result for SHA-256 dded9045ef21d43b…

MALICIOUS

PDF

95.4 KB Created: 2021-09-12 17:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06eb231a6f90fa21f2a2284479984497 SHA-1: 3d43f76ad6046697929bbb60bcbd73365039dc5e SHA-256: dded9045ef21d43b1a994b1295b67d0a045edc2f42ee9a0ee91e42d3a37cc603
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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.
  • 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://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/56917190835.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9969c6b1---torobizemavi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/venulirug.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/74293626264.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/49772951958.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/mugovafategopexijo.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/tupudelidaned.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rimopexurudovokipekebijoj.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/ruzezowikowefa.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/diwofazavu.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210906055403.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/76791656968.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b76f4a2---35917499455.pdfIn PDF document text
    • https://yuktogel.com/contents/files/sagixenivezofitiperamoni.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/simiwajuvubeporakegubux.pdfIn PDF document text
    • http://asfalon.com/__files/file/sewirazobifi.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/nuroxologilo.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/pokamigefika.pdfIn PDF document text
    • http://carszana.com/image/upload/File/56885445244.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/26869529914.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/90285583015.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/57714281680.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/sifumenisixeponixiw.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/poziw.pdfIn PDF document text
    • http://nscenter.cn/upload/files/21055835231.pdfIn PDF document text
    • http://z500.si/files/43986695707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=game+of+thrones+season+7+episode+7+full+episodePDF 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_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 19192 bytes
SHA-256: d0c8c77079cb8d166d7b545681c6e900dd53a0828e6ebf3f8b14ccc7c346f979
font_02_sfnt_off00015647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15647 10952 bytes
SHA-256: fa9a867dda0a9402063a9826e15e2a13273dc31dfb82e795b3580b4ebf25d571