Malicious PDF — malware analysis report

Static analysis result for SHA-256 6851b8e3f39200dc…

MALICIOUS

PDF

89.0 KB Created: 2021-06-12 12:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ef122b042219f48c1d3c4ff7f94e3a0 SHA-1: 206f623274c1de476a2a7804eb3557ad875b9199 SHA-256: 6851b8e3f39200dc030330718b942ebc56548283a08b838a92c72b1189dca2f9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, with a high concentration of disposable hosts. One prominent URL, 'https://archism.ru/pbw?utm_term=knight+rider+2008+tamil+dubbed+movie+download', suggests a lure for movie downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/pbw?utm_term=knight+rider+2008+tamil+dubbed+movie+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465687/normal_6020405bbdf26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_6063f516e3480.pdfIn PDF document text
    • https://folowobudeguw.weebly.com/uploads/1/3/6/0/136051819/sixel_wawafenudetubux_keforubol_nagajuvunep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_60b8a0f1d7d06.pdfIn PDF document text
    • https://fulutikirulile.weebly.com/uploads/1/3/4/4/134471812/rivif-xuvubeboporolib.pdfIn PDF document text
    • https://togawakavepanef.weebly.com/uploads/1/3/1/1/131163752/doruvi-rexeroda-kanoxuv.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/8766445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5ff7895d72cb3.pdfIn PDF document text
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/2701623.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/5ee1bbb1-254e-4858-b608-f042540389be/angles_of_polygons_answer_key.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144834564/vigaripegux.pdfIn PDF document text
    • http://xemeganavon.pbworks.com/w/file/fetch/144775302/wajapazozadokejed.pdfIn PDF document text
    • http://devopiporo.pbworks.com/w/file/fetch/145185690/sasevogemuzejax.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/w/file/fetch/144673869/15376251977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be39c3f8-61bb-41b5-8cf1-1f266a097d8f/mafomesafosapisumaze.pdfIn PDF document text
    • http://kukebow.pbworks.com/w/file/fetch/145172661/24491869356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57cfc64-3712-4c0c-aeeb-f9fd90e11888/escalas_graficas_de_calificacin_evaluacion_de_desempeo.pdfIn PDF document text
    • http://degagogo.pbworks.com/f/imaginarium_train_table_manual.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/96840844679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f646783-f00a-41d0-929e-05aa6ebbb114/vemawenelotunoratinidowu.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144600690/58488872799.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/f/minesafobuv.pdfIn PDF document text
    • http://madatev.pbworks.com/w/file/fetch/144905817/present_continuous_for_future_plans_exercises.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144508632/elementary_linear_algebra_with_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae1f102-f5b0-4734-b04b-55216f516fcc/28184385681.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 4116 bytes
SHA-256: 61ecd460e13137cceded78ecef043922188e4c25b37018e5c370b868500dc1f0
font_01_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 5788 bytes
SHA-256: d0602724ca23d1198625b0abbf915b541b6a7823f56d585ab3e4f7b5d53bc7a0
font_02_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 11712 bytes
SHA-256: 7faadad2613ebd757dd14615ab5157b29841eac3813b1ded3ea9f112766e7cdc