Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b70936458965815…

MALICIOUS

PDF

88.7 KB Created: 2021-04-08 04:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3cfcd80c4cf19ab868570daa9ea56a24 SHA-1: 249baf9101eef1c3b328afddc423c0ac02db3c20 SHA-256: 5b70936458965815d22b5370dbc80cfc7dd8fa13f9b60542e7b4e2ab4812b238
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting characteristics of a link farm. One prominent URL, 'https://xezojetit.ru/123?utm_term=appeared+certificate+format', is flagged as suspicious and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=appeared+certificate+format PDF link annotation
    • https://cdn.sqhk.co/vujaderaz/chcBhgm/nightmares_from_the_deep_3_davy_jones_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/hjdU3hg/fabfitfun_promo_code_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/jdDjjAq/will_kanto_pokemon_be_in_sword_and_shield.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/amish_tripathi_sita_free_download.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/employee_self_assessment_form.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/gXuzlgi/zujuxijinudumozomuduritev.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/i2RphgP/driving_school_simulator_mod_apk_android_1.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/bank_branch_manager_resume.pdfIn PDF document text
    • http://bcipreactivaperu.com/4d_octagon_card7n9r2.pdfIn PDF document text
    • http://theporte.xyz/is_bodyweight_training_effective_for_building_muscle08f0m.pdfIn PDF document text
    • http://bu-markett.com/livro_anatomia_do_fascismo76y81.pdfIn PDF document text
    • http://rozel.ru/what_does_it_mean_application_in_review_processedr7a1i.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/assess_the_application_of_genetic_engineering_in_medicine.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/10966333146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/webeduzuzefodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dfdb58-0dfa-41ad-8e65-82fe99977fb1/gozik.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/besobuwamosadijuzelodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cc31f8-297f-47d6-a04d-fdd95ccd71ab/17845508643.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/mofezufojikirexavigajoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c35e3db-eac5-4955-8eb4-f1dcec970ef7/the_wretched_of_the_earth_chapter_1.pdfIn PDF document text
    • http://lopakesuzuw.atwebpages.com/amparito_roca_guitarra.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_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 5080 bytes
SHA-256: f657263301c77ac755c6fee10e21a94e96c6a1b0c204fb69f5bf46cdd822694b
font_01_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 11524 bytes
SHA-256: 7df8e42278a25cbbc178c118db433a0d7f649bf5f6ef4c6b9024d63b100032f3