Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b4e0b9f1709add…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 17:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 11b8952122eb5e7b5dd5d29c56a71787 SHA-1: db9692a05ad17f1cbcb1e59c6895fc0a4b77f73b SHA-256: f2b4e0b9f1709add3ef0232a5f7720b374bbb71824ca4679fc080a146d36e9a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting a phishing or content distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to potentially malicious sites.

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://jacksth.ru/strik?utm_term=mirror+work+louise+hay PDF link annotation
    • http://fufexak.22web.org/categories_of_special_needs.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/libro_geometria_analitica_dgeti_resuelto.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/toxeju-koredugekureduz-nivamegujip-vezesisoxukojav.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/T92aijA/android_10_notification_sounds_not_working.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/clasificacion_de_los_animales.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/modelo_canvas_lienzo.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/77493054864.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/fid23De/8185523396.pdfIn PDF document text
    • https://zinixukugezevul.weebly.com/uploads/1/3/4/6/134612333/1530327.pdfIn PDF document text
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/3658556.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/bhattacharya_surgery_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hflnLgd/zomawoza.pdfIn PDF document text
    • https://gipebikurowa.weebly.com/uploads/1/3/4/0/134095939/3585883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomekijisev.rf.gd/66021106398.pdfIn PDF document text
    • http://kavimefejemud.rf.gd/types_of_energy_worksheet_grade_6.pdfIn PDF document text
    • http://rotitow.rf.gd/59184261554.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/vifatozerimixavunamazimub.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/tokisokexajerala.pdfIn PDF document text
    • http://tamegebodow.epizy.com/dungeon_travelers_2_trophy_guide.pdfIn PDF document text
    • http://jekabuwof.rf.gd/simujizikeboredabebi.pdfIn PDF document text
    • http://devepovamijube.epizy.com/self_guided_tour_of_washington_dc_monuments.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/penulu.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 5036 bytes
SHA-256: 9f6e49a1e77e96a3254c1eff5fda757175b012c83505bbb9ce89e84a77514be9
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 11664 bytes
SHA-256: d81e349ad4507610e33b8ce18b9157cda73f98c0c39147b090efa9dedbba70e5

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