Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b5ae788ec0ff99…

MALICIOUS

PDF

77.8 KB Created: 2021-06-06 06:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d8be72aaaec8573382c0313587f058e2 SHA-1: ba57d5704d5083e32009e4041a8f319d52c75f64 SHA-256: 64b5ae788ec0ff992c5911c22807a3c4933d0e6238716c39a5bff4d5f3e4cfa3
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, including one to 'druttle.ru', which is likely part of a phishing or redirection scheme. The document body, though heavily obfuscated, suggests a lure related to technical support, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://druttle.ru/123?utm_term=tcs+technical+support+interview+questions+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390055/normal_5ff49de5eaa6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_60134088559df.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/sumotipimadanane.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/wijab-vamumuludinup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogekinovag.pbworks.com/w/file/fetch/144474210/49825968181.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144417990/3153581043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee2f597-c023-45af-8697-f5e6138f3e7e/mametubusire.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/f/birumoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006252b8-ed86-4e24-ad6e-61a9b5e5ef00/how_to_program_bose_700_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cc0fea-a622-4c8b-bf88-87a4a0ea17d3/words_their_way_primary_spelling_inventory_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3278119-a3cc-49cc-93ad-81301297d2de/how_to_do_russian_volume_eyelash_extensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27263e0-50ac-4377-95ea-e3a12b56e682/what_is_the_purpose_of_agile_methodology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8c7d3f-b20c-41af-83f1-9fb74e8df7a7/30974270887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7be239e-4a6a-4caa-9b76-ce0006276ac3/75400224349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88cda30-a5e8-4977-bb2b-0f00a5c2ab52/46260170512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21ff2cf-2d00-4651-96ab-f64780544691/cs_go_freezes_randomly_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6082ef-6cc9-47a6-b9ca-6484de1868a2/23488555890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdbc5e8-122a-44fe-a216-abc0aab5b327/princess_diaries_3_movie_release_date_2020.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144546231/carl_jung_theories_child_development.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/euro_truck_simulator_2_apk_indir_android_oyun_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d837a351-812b-4e82-8c43-8dd39d651b11/wujofodugaxole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db398269-4651-4beb-8270-3e0943957c0b/biblia_en_hebreo_y_espanol_gratis.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_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 5248 bytes
SHA-256: 66ab9fb0accc278bf33f2ad9ac8bd9c1103c9a15e9e16810f514c828b687f229
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 10648 bytes
SHA-256: d97f70fbcd1692e95e5af21f17f32a7f279633f5110a3212292fa093fe6fa503