Malicious PDF — malware analysis report

Static analysis result for SHA-256 190ff0dcf0e4d5cd…

MALICIOUS

PDF

83.3 KB Created: 2021-04-22 13:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb39d58193c51f05bdc127e11f05e784 SHA-1: 9196f6ba69e7ae6a25005fbf079b13f655d241fa SHA-256: 190ff0dcf0e4d5cdaaac9d5dc03df59c17ed06de7342788d81970813e6952df3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=best+self+tanning+lotion+at+target
    • http://gelokan.sportsontheweb.net/kukiwidezulogasukuz.pdf
    • http://nomudepalak.medianewsonline.com/juzawijizu.pdf
    • http://devedilazabu.medianewsonline.com/vixuxigexitulerofepurul.pdf
    • http://jepegupunu.mygamesonline.org/what_does_the_rising_sun_mean.pdf
    • http://fagilef.getenjoyment.net/rowezetuzapewi.pdf
    • http://mebets.xyz/typical_exit_interview_questions_answerscvqx9.pdf
    • http://reduslim-ordina.site/696635283143kkl7.pdf
    • http://zufabud.22web.org/ruvabumemurisotivakolizer.pdf
    • http://look-hotel.com/scientific_poster_template_a1_landscvmquy.pdf
    • http://guvupokive.iblogger.org/morakopawezolumoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dujazenemelix.epizy.com/whirlpool_accubake_gas_stove_manual.pdf
    • http://jidoreno.epizy.com/73392144620.pdf
    • https://uploads.strikinglycdn.com/files/d92a9e53-3a9a-4a2f-8931-525dbec4077c/what_is_the_symbol_for_dow_jones_industrial_average.pdf
    • http://guxudapese.epizy.com/landforms_worksheets_in_spanish.pdf
    • https://s3.amazonaws.com/bupesejirijejus/template_for_staff_training_plan.pdf
    • https://uploads.strikinglycdn.com/files/21d0ddce-8628-48b5-87b9-788624cd662b/jijevejor.pdf
    • https://s3.amazonaws.com/tonisefoteka/monsters_inc_2_return_of_boo_imdb.pdf
    • http://folilef.rf.gd/3564086919.pdf
    • https://uploads.strikinglycdn.com/files/b949db8b-4bb4-4ca7-b671-1be6e2e9ad05/88972189390.pdf
    • https://s3.amazonaws.com/jaxesabi/bijli_bali_dj_song.pdf
    • http://bokatamekal.rf.gd/56202695609.pdf
    • http://mejavukozabol.rf.gd/mupozevofojo.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/calistenia_rutinas_y_ejercicios.pdf
    • https://uploads.strikinglycdn.com/files/0ca26212-b44e-4d94-9794-e43c3c286ee0/bow_tie_pasta_with_italian_sausage_and_broccoli.pdf
    • http://xediguvodolej.epizy.com/kigezeferevulegu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0e.bin
66e7856cc492c7eec04e17f28ec964d6348cd5b07d3732ef46bd0d6ee47f55df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 4984 bytes
font_01_sfnt_off00011b19.bin
07cb95614f3925e34150615df54ab6a38cbb613ede80e17f2cf7ff89bd23b974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 10808 bytes

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