Malicious PDF — malware analysis report

Static analysis result for SHA-256 455db9e6994fc14c…

MALICIOUS

PDF

101.1 KB Created: 2021-06-14 04:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 099b0fec32c937b5cd7fe41f12a7f9da SHA-1: 15e2d338f92f2d8fa294d39ca380490951834975 SHA-256: 455db9e6994fc14cecf4952d5eb9b8265c5b61e77ad56890790c9f698ebdea2c
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm designed to redirect users to external sites, specifically mentioning a URL related to 'Five Nights at Freddy's 3'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/pbw?utm_term=five+nights+at+freddy%2527s+3+all+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fe9a168c4d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_6035bded80f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_602855465d427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_6063b15bc4bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600beef77038d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gositafexok.pbworks.com/f/57318125473.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/ejercicios_de_multiplicacion_para_nios_de_cuarto_grado_para_imprimir.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/145218495/calculate_the_atomic_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09380d0-e3c6-408d-9859-86b3319a4603/what_is_learning_centered_approach.pdfIn PDF document text
    • http://gositafexok.pbworks.com/f/attack_on_titan_season_3_1080p_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8b891d-a868-42ab-95ec-a8ab77453f4f/icom_756_pro_iii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da59ee7-5f6d-4ba3-92f4-b30fce63a1c4/craftsman_31cc_limited_edition_weedwacker_wont_start.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/w/file/fetch/145014009/gta_vice_city_mobile_mods_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e84ca1c-883c-42bf-8ec5-766b66ee4504/rajonomakoxu.pdfIn PDF document text
    • http://sofabiz.pbworks.com/f/let_reviewer_prof_ed_with_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c56531-8d83-4713-bb36-359758b704ae/hay_cursos_de_ingles_gratis_en_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d579919c-286c-4a75-9faf-685c91fb1efd/cloud_of_unknowing_swans_lyrics.pdfIn PDF document text
    • http://zofurutatag.pbworks.com/w/file/fetch/145154766/97303295219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e3804e-5612-4f41-b869-63510d6d1abc/how_to_reset_a_kenmore_elite_stove.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/f/the_tempest_in_modern_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81db6248-03e6-42ce-9d67-dcec2f2e8bc7/65177866542.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_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off000133fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 5596 bytes
SHA-256: a4d7b5df9b55b4242c16da4b2d4d37f46600e4097685f1cca58fa9c0592fc2c2
font_02_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 12656 bytes
SHA-256: 84dc7861e57d13652c0b29bd16ea0a44ca9db9a356659c7fae6fd8c193a68194
font_03_sfnt_off00017045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17045 16212 bytes
SHA-256: 9d8e89b9002d5b0679609df69c0248978edb9418cc98d39e930e7c7361a1c543