Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ca22c45433b017…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 13:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e155c32a9d77ae7b12af97c9999aa360 SHA-1: 3831cec279819beea414f86554bbedd44a114198 SHA-256: 73ca22c45433b0171e4a8e51391ee2109c2155ef90a9887a132a5d6e4eeeae56
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used for phishing or to download further malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command sequences within the document text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://crysiq.ru/uplcv?utm_term=pubg+mobile+game+instal PDF link annotation
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/begadilinijoxexobolas.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/kupedegotugupesewugura.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/jixomuvotudapopufusonume.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906050917.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/58724543943.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xagufuf.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/36614464650.pdfIn macro / runtime command snippet
    • http://cp-tournament.org/ckfinder/userfiles/files/41545300957.pdfIn macro / runtime command snippet
    • https://ladangmimpi2.com/contents/files/51996702291.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/75492461736.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/worodakoje.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce95822d2---628498218.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19814999267.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/bodima.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/gezarofemuxiwifuguzer.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/keguva.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/13709961285.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/filumutodomam.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/mejaj.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/46822454573.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/61409485377.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906123144432620.pdfIn PDF document text
    • http://coumert.com/images/file/dubamuvanag.pdfIn PDF document text
    • https://beautydiction.cIn macro / runtime command snippet
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/jawenuju.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 18384 bytes
SHA-256: 9107818d999581b81f550f40a5a554e6c06edfb0387cb5a00ec1496ad4273bd7
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 10592 bytes
SHA-256: 16c57352d70fb952d15e2bcb8b50ecf15ad768b84f2ad78530e171bb6887db66