Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b445b2198688f2…

MALICIOUS

PDF

79.7 KB Created: 2021-04-30 22:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2422042445fe248ca825ff360d465744 SHA-1: 2003445ebdd37da58047cf315faf579a45731068 SHA-256: 13b445b2198688f22d417c409173197045b75ac7ca60f63eb69f0639e481ce4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious lure pointing to 'jacksth.ru'. Heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL analysis strongly suggest malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=what+will+be+visible+in+the+night+sky+tonight PDF link annotation
    • https://cdn.sqhk.co/bikugipozamu/X3hchfP/slink._io_free_snake_games_for_pc.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/how_to_install_jupyter_notebook_in_python_3.6.5.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/hg8hjHm/rovixotigakur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490722/normal_5ff508bc888a1.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/pHgc2gj/stickman_skate_battle_mod_apk_2020.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/53571103161.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/fnUSZib/vofituvolomokawivino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_6032e180bce9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaravugudag.rf.gd/wow_wotlk_demonology_warlock_guide.pdfIn PDF document text
    • http://lodusuvixad.rf.gd/26103075162.pdfIn PDF document text
    • http://nebokidib.epizy.com/the_darkest_minds_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/saitek_x52_elite_dangerous_bindings.pdfIn PDF document text
    • http://nogomazarem.epizy.com/bollywood_romantic_song_whatsapp_status_video.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/3358046918.pdfIn PDF document text
    • http://moxutomib.rf.gd/choreographing_empathy_kinesthesia_in_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/50543395047.pdfIn PDF document text
    • http://xitozowofuza.epizy.com/angulos_en_un_circulo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/what_does_the_bible_say_about_christmas_trees.pdfIn PDF document text
    • http://nanugubodiw.epizy.com/20757314831.pdfIn PDF document text
    • http://xoxexanizeb.epizy.com/apparel_marketing_and_merchandising.pdfIn PDF document text
    • http://bunebuka.rf.gd/21998976008.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/54407609410.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/dididu.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_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 5324 bytes
SHA-256: 1bbc1706eaa918e4c28cee35333b84101d6973aee63ccbbb27b0cd8e3bc0aacf
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 10796 bytes
SHA-256: 62e7f958429bed3e05bc93e27fe551cb04ba85921897699c55d7e4c699d71d0c

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