Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb48b15b3bf3ef91…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 01:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc577506d2622302380a7370e8ac676 SHA-1: 773906ecbbad2fcdf4ccb60492b462df432399f4 SHA-256: eb48b15b3bf3ef915bab5b78441ca1b2e583ff259c4a7ac1cd2b2f765aff895f
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, including one pointing to 'dafemum.ru', which is flagged as a link farm and potentially malicious. 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 URLs suggest it's designed to redirect users to harmful 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://dafemum.ru/strik?utm_term=como+saber+se+um+cachorro+%25C3%25A9+de+ra%25C3%25A7a
    • https://cdn-cms.f-static.net/uploads/4406771/normal_60250c8e61bbb.pdf
    • http://rowewuxeg.getenjoyment.net/90476941513.pdf
    • https://cdn-cms.f-static.net/uploads/4470205/normal_60311b1659e2d.pdf
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/rezal.pdf
    • https://cdn-cms.f-static.net/uploads/4411937/normal_602cfb7f6da0d.pdf
    • http://fapubozapanez.iblogger.org/what_book_comes_after_the_color_of_magic_audiobook.pdf
    • http://xaduwojitodefo.66ghz.com/embodied_cognition_theory.pdf
    • http://rukunikuxajosog.22web.org/fozasutitafebuwijeninuso.pdf
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/lixotaradeposit-dejewebunogu.pdf
    • http://tejasatobes.medianewsonline.com/ernest_hemingway_son_death.pdf
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/d91748a0d8ce094.pdf
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5ffc108a43f9b.pdf
    • https://cdn-cms.f-static.net/uploads/4493917/normal_6050e755e470f.pdf
    • https://cdn-cms.f-static.net/uploads/4382976/normal_602f79e7a2e81.pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_604b695233cb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bubevaziper.rf.gd/aadhar_card_mobile_link_form.pdf
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_438e66fb0d394fc9a19e67c8f946e41d.pdf?index=true
    • http://pabixezo.rf.gd/47337350034.pdf
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_2bf09e7d11c84bc9ae75aa6caa0bf373.pdf?index=true
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_7ba85d82a1dc441283bade0e113bab76.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_95cdd9c03fa945aaadc293c607c6f8c8.pdf?index=true
    • http://limoxukuk.atwebpages.com/universal_laser_systems_pls6.150d_price.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_193f585dc8d64fc2bbd5ce252f03bfce.pdf?index=true
    • 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_off0000ea33.bin
c71335834ed9ce35d0efe1d107f0fb2f821a9290871200dcc9c046478c68cacc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 5516 bytes
font_01_sfnt_off0000fc30.bin
0ad10d81f98dbbfdcb4dd6835bab8d9de99e112f1c979ede2bc2ee3bbf030fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 12380 bytes

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