Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da33445c481fd6e…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 18:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c0307283806ec61395dec3980674d91 SHA-1: 2a58096fd0b956d359a50b29cc8f3b5184a9d0d8 SHA-256: 3da33445c481fd6e0896443b53711cea6179b027ed70b56eea2bda8aa029cb07
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=film+business+plan+template+pdf PDF link annotation
    • http://helpverifedbadges.com/bob_evans_menu_pricesy81f8.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/xadosiviwunome.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/imagenes_de_caras_emociones.pdfIn PDF document text
    • http://stebsmeh.space/c_oops_interview_questions_for_3_years_experienceewoqd.pdfIn PDF document text
    • http://sportplays.ru/mortal_battle_fighting_gamesku153.pdfIn PDF document text
    • http://7lessons.space/fomogajawigim6ci0r.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/brideshead_revisited_sheet_music.pdfIn PDF document text
    • http://item-mask.top/13976741530qkiyc.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/zefopazicpt9s.pdfIn PDF document text
    • http://vanlit.ru/totomisesenekeumx.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/curso_de_violo_popular.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/aws_solution_architect_exam_questions.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/bangla_golper_boi_file_download.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/how_to_save_something_on_paint_3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodedewezijore.atwebpages.com/log_base_10_ti_89_titanium.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_8c7acb11a8a2486498f38dc7cd4b8b2f.pdf?index=trueIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/wujegoz.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_86633d269e404609a0ca67041bb980af.pdf?index=trueIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_9de3f49965a440e28b7a282b2091d3e6.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_3579e4a1a08942e38243cfef9670144b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3e5e49-04f4-4b05-9068-e3bc59ebe3a2/naeyc_standards_for_initial_and_advanced_early_childhood_professional_preparation_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae9886d-8875-42c3-bb1d-8597c9db8c25/logitech_z506_5.1_surround_sound_speakers_drivers.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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 5188 bytes
SHA-256: bfb14352b3c8c04b86164423f38bbd3129e992926d5b9f42c227f31d8de30b26
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11428 bytes
SHA-256: 53a7ed516865bb3b6fb0a6db2b0dca356d6458b147347781f652252e5cf7b38c

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