Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38c0104a8966a3a…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 15:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f0a8b55989926790164027f9350d0f31 SHA-1: 20ab812cf25ea1f61b6702e6656a9bfb5f2dfb19 SHA-256: b38c0104a8966a3a5608e8f30c36a42d4a52679b1519ac7e5ae7bc5ab88178e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports a phishing or tracking objective. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=valentine%2527+s+day+worksheets+for+3rd+grade PDF link annotation
    • http://wiwajekirutiw.scienceontheweb.net/manfaat_bunga_telang.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/watinozelexanokolat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5fda84e42ab00.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/xbox_360_controller_pc_adapter_setup.pdfIn PDF document text
    • http://opensalon.xyz/who_does_ahsoka_tano_marrygol4f.pdfIn PDF document text
    • http://garant-ritual.online/papacambridge_physics_past_papers_ig9vuv2.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/neumonia_tratamiento.pdfIn PDF document text
    • http://redtea.space/masterminds_movie_engagement_photoscurn6.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/student_attendance_form.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/mekefebonakazefo.pdfIn PDF document text
    • http://zyzycheat8.xyz/suzekavixadumulodekuxuvewcf3ae.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/ceclia_meireles_livros.pdfIn PDF document text
    • http://goshop32.site/17399330117vlsqj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_606aac2c7b8e6.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/50143748375.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/tutorial_point_c_language.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_288a8a3544f043e6a5bfb26267e70f86.pdf?index=trueIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_0a8c88911b3e4d7aa4a50e9dee2b2494.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_c61086451dc948ffab11ff65bab9253c.pdf?index=trueIn PDF document text
    • http://xedemigu.atwebpages.com/zoberabanenuxa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 5588 bytes
SHA-256: 51fc946733b403063b1bb6f80945ff1cb2db7cba86a7eaa1adc7bc95f53f9ce8
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 11236 bytes
SHA-256: 01396cf541fdc30f71948968930599326e3808bcac0eeb756bb7500a61e257fe

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