Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3b4002a361654c…

MALICIOUS

PDF

82.0 KB Created: 2021-06-05 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 04ff8571c6e56cf6800b3be39bb79199 SHA-1: ebb8b9519b7f5b09a642efab58e657ebda15cdd4 SHA-256: fa3b4002a361654c86c803a28fb86ac7a4ca4ac44d9888a14bd3c57b64e265c6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a deceptive title suggesting a vocabulary list download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=food+vocabulary+list+in+english+pdf+download PDF link annotation
    • https://wasaxedunup.weebly.com/uploads/1/3/1/4/131453111/2666636.pdfIn PDF document text
    • https://nilemesobipefuj.weebly.com/uploads/1/3/2/3/132303022/mijisopu.pdfIn PDF document text
    • https://satutetijin.weebly.com/uploads/1/3/4/6/134635437/6287844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_602195cc45de3.pdfIn PDF document text
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/2c8f9ee84b7ecc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_60511e19a4490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5fdd7f5b32945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6059f59130f32.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/6718784.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/9b378081.pdfIn PDF document text
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/nipok-zofazedoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_603344fb6a248.pdfIn PDF document text
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/45448fb62d32bd.pdfIn PDF document text
    • https://sutikarojujo.weebly.com/uploads/1/3/4/3/134343437/4045907.pdfIn PDF document text
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/nipotajizon-zatef-xomekamuzela-segitu.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/6193203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonumutat.pbworks.com/f/55664102479.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422991/bahubali_3_movie_download_in_hindi_hd_720p.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/ejercicios_de_pronombres_de_objeto_directo_e_indirecto_en_ingls.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/cancionero_de_guitarra_facil.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/god_of_war_psp_apkpure.pdfIn PDF document text
    • http://xofitesu.pbworks.com/w/file/fetch/144568404/lotopogowitopetidogaxeb.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/w/file/fetch/144496023/what_is_r_in_chemistry_pvnrt.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/50921865694.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/how_to_write_bank_request_letter.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_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 5768 bytes
SHA-256: ead2c6cf0fa4ea87b1f16173a24a1f03cdb234982fbe9bde85620f26bd3dba99
font_01_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 11160 bytes
SHA-256: b9a802019ffed24557d4cc0f7298644f27c63ad0326edd3d15c2c6c7e451f7d2