Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8d75f3e61bf2bf…

MALICIOUS

PDF

92.8 KB Created: 2021-04-01 07:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cafff1da7defd1ef6688ddf2141e3f8a SHA-1: 6a7672815554db21c2d674952621aacaa0b8c4a0 SHA-256: bf8d75f3e61bf2bf49c861a94cc5f60db943f8145dbeee1d04ecf0808094ebf3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that suggests a lure for free software, specifically Adobe Acrobat Reader Pro. The presence of numerous external URIs, many hosted on disposable domains, further supports the phishing and link-farming nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://xezojetit.ru/strik?utm_term=how+to+get+adobe+acrobat+reader+pro+for+free PDF link annotation
    • http://vutunema.mypressonline.com/transistor_s8050_datasheet.pdfIn PDF document text
    • http://rawenspant.online/music_theory_quizr99zu.pdfIn PDF document text
    • http://nosinoski.shop/loligiritibuxoniserowspp4y.pdfIn PDF document text
    • http://lg-copyrightforms.com/ketebudinebaseputj0qc.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/cardiogenic_shock_management.pdfIn PDF document text
    • http://clebohets.xyz/precio_libro_azul_corolla_2015iljgh.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/65896288687.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/34692654143.pdfIn PDF document text
    • http://trikolor.site/rawukevabix3np1a.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/english_grammar_exercises_past_tensep1ydc.pdfIn PDF document text
    • http://hookup671.site/what_is_the_egyptian_hieroglyphic_alphabet6rq9a.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/pofokajubexisis.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/coordinate_geometry_formulas_free.pdfIn PDF document text
    • http://nyvelsets.online/como_resetar_o_celular_samsung_j2efwc8.pdfIn PDF document text
    • http://fly-drive.online/best_free_antivirus_for_android_phonescl5hi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/edgar_allan_poe_poesia_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9095cd5-bce3-4271-9d6d-667a1d4e785b/18550437218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3fed1d-9e8c-4e8f-b90f-08989649bd5b/xbox_360_controller_driver_win_10_download.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/73743548290.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/sailing_to_byzantium_symbolism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b604e2-7bdc-448d-b7e4-dd72db7926a7/john_deere_l110_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f04072-d91b-4787-82e5-15264dfaf7b8/34772727680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3242f402-1c9c-40a6-ac9a-8a1965466320/balikivisokobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519d1b25-cbb1-4cdd-b037-dad723c5d67a/hp_officejet_pro_8615_e-all-in-one_printer_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fbe2ec-eef9-468e-8b30-bb00c63dbba4/rv_fridge_not_cold_enough_on_propane.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 5336 bytes
SHA-256: 9553b852ba66d858596c52237ff0706371c74e4d8f960d5c434dd649c2606cf2
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 5304 bytes
SHA-256: 0a937f2a65b479886839d132ec3740ec297c2435dabad2733fa889c172074ea5
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 15140 bytes
SHA-256: f61b286450fcd188287c2d80a1855b469f0a4ff50e4f6a75d006c1a25b5e3f72
font_03_sfnt_off00014c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C06 16488 bytes
SHA-256: 1d240a0535f2140f7c954fae970985d54487e451ba4ee00a2f6f8a8e98c285da