Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ebcb4880e4d721…

MALICIOUS

PDF

80.3 KB Created: 2021-04-21 03:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1834619c33a06f14d69c1ee1c0856f87 SHA-1: cfef0831083c96353f943567164509c377e7bac2 SHA-256: 61ebcb4880e4d721f9228ec748b15d37b334e853555a687441795dddc90dffc1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. One prominent URL, 'https://resalured.ru/strik?utm_term=how+to+reset+brother+printer+hl-6180dw', is presented in a way that mimics a search result for printer troubleshooting, a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=how+to+reset+brother+printer+hl-6180dw PDF link annotation
    • https://gonaxazurunuta.weebly.com/uploads/1/3/0/7/130739517/nozonifi.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/filigedajezijinat3ghm0.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/buJmhgX/botusubituz.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/injhseG/sudukigosifevasalorak.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/jiVnAZe/viwikekepobem.pdfIn PDF document text
    • http://idealica-itufficiale.website/free_easter_egg_templates_to_print3ipnb.pdfIn PDF document text
    • http://afterdealer.pro/78813821182hci3x.pdfIn PDF document text
    • https://wevopuvigamez.weebly.com/uploads/1/3/4/3/134320632/gabek.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/geie6zH/carve_woodworking_woodturning_3d_print.pdfIn PDF document text
    • http://reduslimitalia-official.site/28872048956hcrwe.pdfIn PDF document text
    • http://copyright-notice-ig.com/como_aprender_ingles_facil_y_rapido_en_casa_gratis1ttg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5aa9b6d-3a77-4731-9158-dbcaa9a653f3/el_conde_de_montecristo_capitulo_14_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/booking._com_contact_information_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdff9bbd-b106-4cc6-b6ec-d1713ed402d6/xiduvepoluzinekegexekun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5f6cb9-49f4-46c6-a5ed-d41528d0212d/breville_ice_cream_maker_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f2ad82-2a0c-414f-bff8-f9bcc4eb65f6/best_logo_design_software_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9565d7ff-d34b-4435-b2b4-a9d14b498b34/can_fl_studio_run_on_a_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003fc3a6-6faf-4c0c-b2ee-e10301765394/integrated_chinese_level_1_part_1_lesson_4_workbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcabad4-9cbf-4726-9905-ff094cb11f6e/how_to_order_a_jitterbug_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/18865716437.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/lifetu.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/dd_way_of_the_four_elements_revised.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/batman_movie_joker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7048d1bd-6468-45b4-b970-24c9e797e4b2/barcelona_pavilion_plan_cad.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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 5604 bytes
SHA-256: ad5756c24322cd1a6e56b6f6efb25fbd40c646470ff16ee064aa6f8d7365b247
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 11864 bytes
SHA-256: 77e60d556865b0309459d46c320d5f31d1a10967cf0d2b39045373abc2eb1ca6

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