Malicious PDF — malware analysis report

Static analysis result for SHA-256 b466a5425783bb19…

MALICIOUS

PDF

83.1 KB Created: 2021-04-09 20:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ef559b970e521422ae851c81b7e84430 SHA-1: 220b8742aeb1eb9324ae30b595675460efb27485 SHA-256: b466a5425783bb192b3ac89a96a94c94d86499b26b9115444d32424174d8d1c2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary external URI pointing to 'gimoguvi.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=are+sony+wh-1000xm3+comfortable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403819/normal_602943515c5ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_604c9eb429cd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_6003255e0a522.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/bif188K/hype_city_idle_tycoon_apk.pdfIn PDF document text
    • http://dexiserabasavo.mygamesonline.org/sustainable_building_design.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/zQJjcPQ/candy_crush_saga_cheats_2020.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/33548829708.pdfIn PDF document text
    • http://legibovusapezo.mypressonline.com/migration_certificate_form_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_6045bab407921.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/hiHnqid/hd_mirror_cam_reviews_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/jejhIha/rules_of_survival_download_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jekenilegefe/eg8Mgiz/no_humanity_hardest_game_mod_apk.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/molakigenegigebawaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_cbd1bbfaf1a7471fa288c9e6d8cf24d6.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_410adb2a7f2f4946bdeff7a5e303362b.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_e4e515e39da24e108c519f6023e6746a.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_83f1aa348eac47bf8a31b13ca5203892.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/serway_physics_textbook_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/95077027885.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/amplificateur_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/bambukat_punjabi_movie_filmywap.pdfIn PDF document text
    • http://pujumek.myartsonline.com/5_types_of_contracts_that_must_be_in_writing.pdfIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_8465736b35fe46fd83cee1563ce36a3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/b13_bluetooth_speaker_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/rataxojovuparubis.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_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 5904 bytes
SHA-256: 61fabe86f432f51482bc486c136217ff35b18d6d184b095fa75dfb8d9f9c05b2
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 11404 bytes
SHA-256: de8bc76ad6045d767c7e8241a832232f83a770a16a6a8cf9ad1a755b799ce394