Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f73c16e34380bd…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 02:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3cc9bc1761ffc28ba415679ba0285d5 SHA-1: 1672117ff7ee1974c8fbbd639f2b67e35066dde6 SHA-256: c5f73c16e34380bd1b2e959c26b8843a17a1846c937c5d758b9be448c948ebe3
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs disguised with seemingly benign content. These links likely lead to phishing sites or malware downloaders, aiming to trick users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://websurin.net/UserFiles/File/tozumanupavoxekuzeg.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a726d0adc7---79319158851.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/11122368292.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/filokuxemudetomem.pdfIn PDF document text
    • https://icbacademy.com/upload/files/59561923660.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210904200051.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/48027814174.pdfIn PDF document text
    • https://salonrewards.ca/images/file/62129278832.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_083256.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/65011534517.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/75724229571.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/61630893386.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a9c61f4---72064038853.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/26758355898.pdfIn PDF document text
    • https://highrise.pl/file/68753294283.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/46903482535.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/xironubofasevitefinevuke.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/wodasenuzi.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/14849676336.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/89151758722.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/1982519859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+bittersweet+life+full+movie+watch+online+with+english+subtitlesPDF 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_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 11156 bytes
SHA-256: b7bb89dd5707843fd6e3b82f9d32810ac8ad2e70e33a062d7a24273e647aebb1
font_01_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17068 bytes
SHA-256: 5438ceeafb8c84c66ae72d3e420f62a3153d3b055ff8b7af1d2211fcd8c6a7a1