Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b8305779bd6486…

MALICIOUS

PDF

76.7 KB Created: 2021-09-30 10:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3e82ed610d77471aa5d0cbf067711fa SHA-1: 8490cf80d944a3d8e995b5b8068e9da1d3ce0209 SHA-256: a0b8305779bd6486cff5cc0c05fc37237a9f5232f825eac8282f619c90d9c13d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious domains and are structured as link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination by using many distinct hosts with few links per host. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest the PDF is intended to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jcbcharpentebois.com/ressource/site-image/files/69737115810.pdf In PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092804331573499.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/bamiboxelejemofa.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/bujowimubulokiwuwadufo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/dixil.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/89539274220.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/45823177593.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/wejijetedenat.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/fititigozonu.pdfIn PDF document text
    • http://yuhongzg.com/d/files/dekisazapekujirogorarada.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/supawunaside.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fajulatubunex.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/49413212358.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/46561081090.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3995bf3ac---67457187839.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/94099513771.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/22187061160.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/51165392352.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/mokezitozawepunoz.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7ef92ea5---26467759636.pdfIn PDF document text
    • http://prosquash.by/data/84569990832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=almost+heaven+judith+mcnaught+read+onlinePDF 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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 19336 bytes
SHA-256: 0303e1f0eb3732bcdcb4f9a60e778709b3e7c7c3ba2c170ba2749f0b5509754c
font_02_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 11096 bytes
SHA-256: f656121f8edcf75973ec7b97d51a7121e91b6c658f4476a0aa2d72e39a3908fd

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