Malicious PDF — malware analysis report

Static analysis result for SHA-256 270cea533161f70d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72d0268165300dd4a31972581c38acb2 SHA-1: 0cfbfae8db71f511b7326c708c215535a0b3fc00 SHA-256: 270cea533161f70db30a09ab1a83b0611443d1d776bdb88a86436a256833372d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to lure users to potentially malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/75505940015.pdf In PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/podawuko.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/wefedugepakaginepajagetem.pdfIn PDF document text
    • https://techlan.pl/files/file/86719736209.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51432599525.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/mebozaxal.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/silul.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/gefolodifekegifo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/91388166972.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/43865067971.pdfIn PDF document text
    • https://ms02bet.net/contents/files/98373609959.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/26877525396.pdfIn PDF document text
    • http://askaudit.ru/price/gigolexafuribiredamilud.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotareruzomuxijatopolos.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/lunewinon.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161379eb4d831b---61035623572.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/dexedikolorir.pdfIn PDF document text
    • http://z500.si/files/luriwiwilamajukosolemef.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/30493732633.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/somazegudakijo.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nunaj.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/76189919516.pdfIn PDF document text
    • http://bubb.cn/up_file/file/gigigomikapitatij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=system+ui+stopped+respondingPDF 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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 18004 bytes
SHA-256: 1f1f697571c174170148ece944278d92a407d142a966cb094990f2fcc6011d56
font_02_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 10816 bytes
SHA-256: 7ac21a606781cd16101e0df5362039f2ce79725f29e981f079bd0daa4dc14fd0