Malicious PDF — malware analysis report

Static analysis result for SHA-256 967939c35b0af262…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 13:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d429d5ffc5f5b889bacd422e0bc4874a SHA-1: 7052f0e77c5175974bc2efbf44b84add38979d2d SHA-256: 967939c35b0af262d6789638b81fca034e6f3c16dc84634b5d005e9d0cee1f1c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=english+alive+class+5+pdf PDF link annotation
    • http://musicincw.com/fckeditor/userfiles/image/lemiwalulowu.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/pilapekokanidagevo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135372c3c47f---budivagizopajomububififa.pdfIn PDF document text
    • https://network-italia.com/file/79440985450.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///44079357648.pdfIn PDF document text
    • https://digiconelectronics.com/media/nuwulefudalufexowuziseba.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/96397817093.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/65261044243.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/nakuzexoxo.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/17096450351.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/5091690212.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/50905466966.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/17891763564.pdfIn PDF document text
    • http://alptw.com/images/files/69681570599.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/diriteli.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/6312434041.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905190742963914.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/64548454830.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210915173301.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/zegutadege.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/nunuludo.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/retetuvuwim.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/fidaguzebobibofexebakoke.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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 16280 bytes
SHA-256: 2240d3f1febe0bfcb4d5e4c23f250baaddea24a3397f1a98019e9e862d5d9460
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 10764 bytes
SHA-256: a1c7d19463a892de999365a800c6dc7b126475a0655a31fd15531c0fccda365f