Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0529789b79ab79…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 18:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 183128500552d05884cbee5bd09e9791 SHA-1: 28c05b4df512d686c87dcdf17333f43006a7e3e5 SHA-256: 5b0529789b79ab790d04ff38e5a94f006a1bce1f5d03300a519be1a0aeca820d
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a lure for downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://synerhu.ru/uplcv?utm_term=download+game+android+resident+evil+4+mod PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc670069a---sididu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/7855024618.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/50999865106.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/sivudibugutifelavozo.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zaledenujivepo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/roxixik.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/51503473286.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/sojus.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/devupadaxiwudodilibosi.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/10805282311.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19407960637.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/53419632833.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/pijuba.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/jasajiweroputufezivafar.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/78379128302.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/34021973564.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/89437224058.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jerif.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/vawibagopotevijokora.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/tobadam.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/muzesomukotul.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/43101173719.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qah3jlodg2ljtu2aoulf80hdg6/7712084546.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/funojarar.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_off0000c04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04D 10824 bytes
SHA-256: d153c454a1429499cbc42a5094d187783987530531ede6cc5360ae3c23f897da
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 19100 bytes
SHA-256: a7bbbc6507d3b9f2c36f59e0a755d5ed1b257abb1d2c9126f7be897c13522c3b
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1