Malicious PDF — malware analysis report

Static analysis result for SHA-256 68121680d786b472…

MALICIOUS

PDF

78.6 KB Created: 2021-03-13 22:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7876fe6544270bb3bfd7a860ea39f03 SHA-1: 2a8a38e1b067536496f1114176e4a3f9c4e7edd1 SHA-256: 68121680d786b472d34a34376c32dac362616e317d44a6ca4efc38b8970a067a
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting domains, many of which are configured as link farms. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=how+to+find+audio+card+drivers', suggests a lure related to driver downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=how+to+find+audio+card+drivers PDF link annotation
    • http://vuvajujuli.mygamesonline.org/an_inspector_calls_full_movie_1954_alastair_sim.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/gjftjfO/34422307287.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/19994355074.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/diderot_encyclopedie.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/planos_de_casas_modernas_gratis_en.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/how_to_make_kenyan_top_bar_hive.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/sefosimipepozopivebazagu.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/best_book_to_learn_french_on_your_own.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/hajbnib/befemolaruv.pdfIn PDF document text
    • http://refixewu.iblogger.org/bell_300_bike_computer_manual.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/wuwoxib.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/mojifoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://disoluje.myartsonline.com/what_bulb_for_bosch_oven.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/categories_of_chemical_reactions_worksheet_answers_chapter_9.pdfIn PDF document text
    • http://dopovis.myartsonline.com/how_to_reset_toner_cartridge_brother_hl-3170cdw.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/86305332105.pdfIn PDF document text
    • http://fivemawafazixi.epizy.com/60572714686.pdfIn PDF document text
    • http://zumemopusel.rf.gd/fonoratukuburidapujevim.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/appendix_in_apa_format.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/podokepokunanub.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/18519067802.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/siridazor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 4976 bytes
SHA-256: 931859bac2919defae9bc0a9e141c763c4b62518d86ec234c91b0738eec0e873
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 11456 bytes
SHA-256: 81123e198506cc33bf93f4a4a35ed0e688d4967a5da8bf4b24465090ee07b61f
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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