Malicious PDF — malware analysis report

Static analysis result for SHA-256 1980cccd743a5ffd…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 04:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d7e955f54d864b3809277a75a44cc9 SHA-1: d7f844e74a5aed43647a1eda96b91a052e14876d SHA-256: 1980cccd743a5ffda2a6d453039c30a3653c381dd006325a7dae07d1c284352c
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains and some with UTM parameters, suggests a phishing or malware distribution attempt. The primary malicious URL identified is https://ponafet.ru/strik. No scripts were extracted, but the PDF structure itself likely contains embedded links or exploits to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=why+do+we+say+ouch+when+we+get+hurt
    • http://afracheat4.xyz/929716792310xths.pdf
    • http://afracheat4.xyz/populao_angolanaufsai.pdf
    • http://zopokujejisolan.getenjoyment.net/dias_feriados_usps_puerto_rico_2019.pdf
    • https://cdn.sqhk.co/lokiwejawe/fjj5Tge/40453670005.pdf
    • http://betmoy57.com/apex_ld4688_tv_stands04ve.pdf
    • http://woxijakuzadajew.getenjoyment.net/love_in_the_time_of_cholera_literary_analysis.pdf
    • http://lamaded.mywebcommunity.org/ziwizojegapijam.pdf
    • https://cdn.sqhk.co/mudebijutene/jihbEjc/20981957156.pdf
    • http://all-host.site/do_absolute_value_functions_have_derivativesporo5.pdf
    • http://tuderoba.getenjoyment.net/paint_shop_pro_7_user_guide.pdf
    • http://kijofizovurisos.medianewsonline.com/bible_trivia_questions_and_answers.pdf
    • http://tijudozi.scienceontheweb.net/adjetivos_con_ed_y_ing.pdf
    • http://teleporttur.ru/dat_ass_full_comicqg28z.pdf
    • http://vuzetasavuxoso.mygamesonline.org/what_is_error_code_b200_on_canon_mx922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fbaac401-f859-4da5-88bb-fd7a52586494/what_is_the_name_of_ariels_father_in_the_little_mermaid.pdf
    • https://uploads.strikinglycdn.com/files/cdd32fd8-75da-4061-b681-7a0b446dcede/mr_smith_goes_to_washington_questions_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/710e5aa0-f977-4747-aadd-0080eb7b36a6/jinomexasuwewopoluwat.pdf
    • http://xiwozoget.atwebpages.com/mathematics_research_project.pdf
    • https://uploads.strikinglycdn.com/files/1d541590-e12a-4d26-af42-17202e491d6e/where_did_thick_as_two_short_planks_come_from.pdf
    • https://uploads.strikinglycdn.com/files/e16fa295-2d0c-4cec-8d19-e89bfdd9f548/40328239148.pdf
    • http://gajutar.onlinewebshop.net/wutanedozedotu.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_off0000eb23.bin
fb972ed9a39c7013aff11f0265d425cb05bae5f7b263572da7e91169225d38ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 5376 bytes
font_01_sfnt_off0000fd84.bin
1756b9c955fdd92c0064f6ccc8aa091d59d04e64492aef3158505e58cdf7f895		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10696 bytes

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