Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceb81b47d555c00…

MALICIOUS

PDF

87.8 KB Created: 2021-03-20 16:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb8a019e7f3509afe913faf69fe07235 SHA-1: f3cae6a7d3469ba762cbd67b517b3947d9e6ce73 SHA-256: 3ceb81b47d555c00d4db9ea2c2ea149afc0ea3aba13b6df385b21d0d4265507f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'Blender tutorial', directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://seumenha.ru/strik?utm_term=blender+2.82+tutorial+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401555/normal_603a463f7d2b0.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/c0sgije/8044277972.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/4543479610.pdfIn PDF document text
    • http://septiki-rf.website/gowukevugejixebenepeno65xtv.pdfIn PDF document text
    • http://axecheat8.xyz/gre_psychology_subject_test1ra2x.pdfIn PDF document text
    • http://characduwe.space/what_type_of_god_is_freya0ry7s.pdfIn PDF document text
    • http://lusaxesa.iblogger.org/agneepath_2012_movie_480p_worldfree4u.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/Ahfjbjb/vexations_erik_satie_sheet_music.pdfIn PDF document text
    • http://tiktoktop.design/toastmaster_table_topic_ideasla84s.pdfIn PDF document text
    • http://repair-planshetov.ru/81294381781ibd4.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/dhjiagi/89162587041.pdfIn PDF document text
    • http://nikaold.site/kenmore_air_conditioner_and_heater6ov1e.pdfIn PDF document text
    • http://iqecoportal.ru/59894034513yz0jn.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/apprendre_python_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fekoguwiwu/hciigeq/thoracic_outlet_syndrome_exercises_mayo_clinic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_602daa4d983aa.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/koxezilijabobakerewotono.pdfIn PDF document text
    • http://beach-fruit.fun/how_to_connect_jbl_flip_4_to_iphone_8ewqr2.pdfIn PDF document text
    • http://premial.su/gogeginulubepurowrb9jw.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/jg5G5Dr/pentagon_federal_credit_union_login.pdfIn PDF document text
    • http://dupozixafe.iblogger.org/arbys_menu_prices_richmond_va.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kevixavi.rf.gd/97386676578.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/new_cutting_edge_intermediate_teacher_s_book.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 5144 bytes
SHA-256: da4e5df134b64e2eebd961a892df696268ab61edd750a0d9216d695ce37f1d88
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 10744 bytes
SHA-256: 63383d266c49350e55b48b854c5e6b799ff194a19b67e704b8ab8bc433b2ce91
font_04_sfnt_off000137b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B1 6464 bytes
SHA-256: b9f5c7e3fe9ce3d707f12e9531d579a4ad14fd422a6da0284760f4d9790dd485