Malicious PDF — malware analysis report

Static analysis result for SHA-256 f393b7e720a1110f…

MALICIOUS

PDF

71.7 KB Created: 2021-03-12 05:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39f69f510ed1b853ebc9858e27fad5b2 SHA-1: 1a11dbbfccebecccdadeb1f65e5d1e7a634ba42a SHA-256: f393b7e720a1110f87f68e200ca61e84f6bf827af17e10701453e95855985a20
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a primary suspicious URL pointing to 'gimoguvi.ru', suggesting it's designed to redirect users to a malicious site. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards 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://gimoguvi.ru/strik?utm_term=how+do+you+calculate+the+average+density+of+the+earth PDF link annotation
    • http://parhelifrl.space/lenovo_thinkpad_t430_memory_replacement5hpp2.pdfIn PDF document text
    • http://prizinsta.info/gixivamabekr5luu.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/81135220711.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/a_shepherd_looks_at_psalm_23_large_print.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_603948cb2c77c.pdfIn PDF document text
    • http://axecheat1.xyz/how_to_use_a_philips_respironicsb6669.pdfIn PDF document text
    • http://erogan-encolumbia.site/how_to_enter_gerudo_town_breath_of_the_wild19mtp.pdfIn PDF document text
    • http://shopsmmv.site/falejikembxtnk.pdfIn PDF document text
    • http://creditscoreusa.info/comic_book_template_cover9ofse.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/fujulaferofakodavedizoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5feb62114fe31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_60403d818d359.pdfIn PDF document text
    • http://bit7.top/jenirejepojudevatado80kuc.pdfIn PDF document text
    • http://carbackseat.site/mera_gana_baja_de_song_mingkzzjt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c64cda-27c7-425f-a9a9-eb57ec32473f/literary_terms_list_and_definitions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9334bf42-6ffc-459b-9510-a143f5107d87/what_is_the_standard_normal_distribution_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c83c64d-c154-4995-b71a-cdd42d808257/pololibazod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3c407d-5756-49d5-af37-8b9b9d696d7e/24068689580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f93d08-a626-4812-b9af-9a7a84be3651/will_cyberpunk_2077_run_on_ps4_slim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f031c3d4-d7d2-4bf6-a339-a7382473dce7/toshiba_regza_42_inch_price.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 5500 bytes
SHA-256: 072014ad8ca521bda385cf64f025d35c1b4b8dd5f2ec82d40b5585069e34d921
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10388 bytes
SHA-256: 95f693f5678e6978c8e38d13d23f5b3ff852f59439b978c6a42e7fb5cb39a2e9

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