Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a736996d1bb5a0…

MALICIOUS

PDF

84.2 KB Created: 2021-03-27 20:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 821080fad789febce3b888fb5d07a770 SHA-1: 005f11b1e4e53109ff4c2d44a57758614ca80966 SHA-256: 37a736996d1bb5a0d2d23cda5cd250d2a2f334575dd0ae58e9006d65e150dc18
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'dafemum.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+do+you+read+a+1%252F8+scale+ruler In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6035cdb628f3e.pdfIn PDF document text
    • http://detonic-official.website/sucedio_en_manhattan_pelicula_complejmba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451756/normal_600638ec19917.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/gezefer.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/FgdJ0id/gasufabajanedusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451221/normal_5fcd8d403d4bc.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/97th_constitutional_amendment_act.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/9iiii5h/freeze_watch_dfw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_600b356e3e393.pdfIn PDF document text
    • http://bottlechainworld.com/caliper_test_visual_analogy_answers_for_homeworkb6twm.pdfIn PDF document text
    • http://ostanni.fun/zubulumiliwuduooxe7.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/7521301.pdfIn PDF document text
    • https://cdn.sqhk.co/loxakejela/hhdjf4b/vegeta_vs_android_19_ocean_dub.pdfIn PDF document text
    • http://closemaze.com/593933500535fxnd.pdfIn PDF document text
    • https://valabonef.weebly.com/uploads/1/3/1/3/131379230/a665c.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/fonem_zinejupi_maguxexoza_foxaj.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/78193410026.pdfIn PDF document text
    • http://sehq.xyz/the_man_in_the_high_castle_season_2_finale_recap11jpi.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iZzbRhe/spooky_sounds_for_halloween_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_60224bc842aa7.pdfIn PDF document text
    • http://fresh-ita.space/coface_rating_reportkvnyx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davofunup.onlinewebshop.net/acordes_en_piano_algo_esta_cayendo_aqui.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_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 5368 bytes
SHA-256: f2a3e32a9c2bd8377903a341154e2aa548d768aa4a26347f82073b1d8bd26a69
font_01_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 11100 bytes
SHA-256: 5acf14712197e92ebc69806929b851ceaa260030d9125bbff3ac8fbb5b86d5c9

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