Malicious PDF — malware analysis report

Static analysis result for SHA-256 d901b7b1e038b715…

MALICIOUS

PDF

94.5 KB Created: 2021-03-14 05:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f38cbe73d4a81c5d976234c1c8050ba9 SHA-1: 767bf6a6ac159104fc8535dc07f2ecf21e7cc823 SHA-256: d901b7b1e038b715e4364ad0dc3d37c85c784ba65354e8671b207eb00cc256bf
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is part of a link farm designed to redirect users to malicious sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM firing and the numerous unknown reputation URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/wix?keyword=wwii+paratrooper+gear+list
    • http://alifan.store/198667008601rg7y.pdf
    • http://introdom.ru/grasslin_timer_programming_instructionslwc2i.pdf
    • http://gepanukotex.getenjoyment.net/best_math_workbook_for_5th_grade.pdf
    • http://top-salez.site/repegowibifululnzsn1.pdf
    • https://cdn.sqhk.co/zajujinul/jhjhAgh/2432028910.pdf
    • http://nafarami.medianewsonline.com/what_are_the_14_principles.pdf
    • https://cdn.sqhk.co/sirepajaku/jiyGXha/62139690505.pdf
    • http://tesar-krd.ru/gigafaledalujoguwilojevtrsy.pdf
    • http://nipijapogila.sportsontheweb.net/dr_heideggers_experiment_study_guide_answers.pdf
    • http://portkamesto.site/337250678511exey.pdf
    • https://cdn.sqhk.co/guxuboru/VKjS6fb/10980872677.pdf
    • https://cdn.sqhk.co/nibubovixif/jagcjdW/new_alphabet_song_lyrics_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvemasoxaji/rividimifuliko.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_99c816d3bbcd402dad4493c4ba6b2a04.pdf?index=true
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_00716afbe40547af819debd7863b2281.pdf?index=true
    • https://s3.amazonaws.com/zafaronivaj/formal_word_for_buttering_up.pdf
    • https://uploads.strikinglycdn.com/files/4a58af54-3e87-479e-8fa9-228347189613/ernest_hemingway_museum_six_toed_cats.pdf
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_cc88143c1d7c475f91675717db5811b7.pdf?index=true
    • https://s3.amazonaws.com/mokuwanibof/13346615221.pdf
    • https://uploads.strikinglycdn.com/files/b26e4b1a-c10e-48de-a037-e607dbca402e/positive_psychology_baumgardner_free_download.pdf
    • http://lumosaneja.onlinewebshop.net/78076826078.pdf
    • https://uploads.strikinglycdn.com/files/e094e30b-8041-4be8-8780-53c529c96d6d/lewis_dot_structure_worksheet_chemistry.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_c902410e6c854bcfbf45916a5f9f59ac.pdf?index=true
    • http://kilarosine.atwebpages.com/how_to_make_a_target_stand_out_of_pvc_pipe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135d0.bin
e972364fdc3c474d65ca216630779c618a194bdca8de16d5a643dfadec03af8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 5092 bytes
font_01_sfnt_off00014749.bin
678c426eef331d839789de4e8432fd40ed8f1a95af39126506b402c268478c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 11064 bytes

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