Malicious PDF — malware analysis report

Static analysis result for SHA-256 813bac997956a67f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 17:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6db4f82bd32baa868567c5c8a2f231fc SHA-1: c9f6360845c6dbe1ccd14aeb1d538a488c1a9a36 SHA-256: 813bac997956a67f0290328869b0ecf55cd904e8c0efafa1110538ffb8db4f76
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier also flagged this PDF as malicious. The presence of numerous links suggests an attempt to redirect the user to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 4

  • 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://salonorganica.ru/upload/files/65063386426.pdf In PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/51619220348.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/zijikagezavevedegibilison.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/99951535592.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7f7e80ae270d3d945315fc25dc09ae8b/31928443497.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/36602246494.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/midave.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/25746919825.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/biwemimomelogazafid.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/76928655331.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/nolokokif.pdfIn PDF document text
    • https://miet.hu/kepek/bijusewud.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/64959900854.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/lekosetupato.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905172755.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/zupilinir.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/38463363032.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/sojadetetobefokoxetuvi.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/76560717258.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/nuzanavofewevo.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/bomotiletafopanibal.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zumabegusawodusejatato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=4x4+drive+suv+off+road+simulator+mod+apkPDF 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_off0000acfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFA 15932 bytes
SHA-256: 7234ba4435c6d24d1829a424f58884da77ba0ba850722d2c327994795ced6a13
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10896 bytes
SHA-256: e2a6e09c421413b828c693b01cd561c77a5218de280e07d7ad557289a3751436