Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3a8f9746c5332c…

MALICIOUS

PDF

74.7 KB Created: 2021-03-29 03:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5df799dbb26fbeb7da7ebb95bfbea6e0 SHA-1: 972f2c0264f7c8c21512199690312afd963db53f SHA-256: 5f3a8f9746c5332c6249f4b00477ceee55dc31b8a66a2c263ad39548d3e84630
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, including one flagged as an invisible link to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/award?keyword=case+studies+in+ophthalmology+for+medical+students+pdf PDF link annotation
    • https://cdn.sqhk.co/rogevuzazi/hchgjje/49543189697.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/how_do_i_connect_my_hp_photosmart_d110_to_wireless_network.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/Ihe7Ahc/the_monster_2_3d_printing.pdfIn PDF document text
    • http://gatorama.space/ge_spectra_oven_manualumu53.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/hhiiosb/home_schooling_options_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/aGxemhb/video_background_remover_software_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/RS8oaIK/45605340785.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/vutetuwagotimi.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/hlihoge/bedotamozidafoxuvinew.pdfIn PDF document text
    • http://pixxel.life/simulacro_de_evacuacin_escolary4tf5.pdfIn PDF document text
    • http://midimox.getenjoyment.net/past_tense_and_past_participle_list.pdfIn PDF document text
    • https://cdn.sqhk.co/mibolujo/Ribgi7C/professional_development_plan_template_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/xDdmujd/dolby_on_record_audio_music_apk_download.pdfIn PDF document text
    • http://5-euro.info/2674774685322ft4.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/hcjjifB/all_website_video_er_for_android.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/58280796910.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/is_hamilton_beach_a_good_toastergg2gk.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/c2ifdii/seahawks_packers_game_time_today.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/bloons_tower_defence_5_towers_guidepsk8m.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/Hjijhic/wesit.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/hhyhdjj/17967909414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bememikat.onlinewebshop.net/delevawuxolasuke.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/17887255384.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/spring_boot_tutorial_tutorialspoint.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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5576 bytes
SHA-256: d8544b88db678585062505f2aa3cbc428d5a7e16bbd7397790ccd5f920950309
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 10988 bytes
SHA-256: ad385496318dfdb3f28745e20a670bfed0461147df899f7fec2cfce5206d6671

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