Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c4bdddb20bdaaf…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 19:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7673e40f5bde4b252f282d5a6c8a3a78 SHA-1: 1b73eb75265a25b78005cbb991fb1cafde1d635f SHA-256: e2c4bdddb20bdaaf9ee0a33c1604c884609e5a56e7bfee27cf29ed58337b86b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of external URIs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://garglob.ru/uplcv?utm_term=live+desktop+background+windows+10 PDF link annotation
    • https://vieclamlaocai.vn/webroot/img/files/lezijiwovikirimaro.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dudomuxedes.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/45521771605.pdfIn PDF document text
    • http://agmapure.com/upload/files/godiredazofopemilolizod.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/30950975208.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/39591899724.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/32857021484.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/38736491954.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/54211510988.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/72579220019.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/152104053.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/18206856998.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fenowuwi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/4012642856.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/24976615130.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137fabcce4a3---kifixalitataliliki.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/xitobo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614549d356828---58417003501.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/19230286808.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/mejivofagibipebajisome.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wagitod.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/defijul.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/39066753339.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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 11260 bytes
SHA-256: 3a8f3fc6068763b30268eeb08530262ca4d8c483701794a64744de0bb747ec39
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 18244 bytes
SHA-256: 59585be01a4add5045cd8736e8f0f58a178904e0d60691ea2d1db5da76d92009