Malicious PDF — malware analysis report

Static analysis result for SHA-256 948638e934e10103…

MALICIOUS

PDF

84.7 KB Created: 2021-09-23 20:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ebd1b935648b1983083cbc5f105a430 SHA-1: 0f3a7161c5a1b141aa42e4294297b9aa724a818c SHA-256: 948638e934e10103932e39be4f91b6dbd7bb6204ff486ec769e0329054114282
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to distribute malware or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=download+music+to+android+tablet PDF link annotation
    • http://abwcolley.com/uploads/files/59599883782.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/jenuwoxugegixorelutawij.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/rafuvegenimesezilina.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630788832.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/88335847483.pdfIn PDF document text
    • https://renetravel.ro/images/files/nebigasoruzasevo.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/kiminin.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/jawupovuwosixelagaxaxa.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/nukisudenalijofififuvo.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kopatanerekeritinizimabi.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/medamafakavana.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/11263848378.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/49357100993.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lefipefiju.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/nozodurikug.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t3jl3f5goagro3hcjoma25ek9l/niniv.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/dagivodesawavatejon.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/69156409593.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/81682529658.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gegutelefesimopaxevemawa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614305bb28906---xafodumano.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/lotosomutatukenomuguxekuk.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/60906359522.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/motawapalubinutoxege.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/64041418757.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_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10860 bytes
SHA-256: dbb42a213c7a43a5dfa20f9b4d7bf5b71a3518bdda1c787b590cdac4a20364f4
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 18676 bytes
SHA-256: 8f731f5f3a10712b8a1949f17610970acc8d09f7e5987b4dcc0b8cf480a137a7