Malicious PDF — malware analysis report

Static analysis result for SHA-256 48371e0b5a89f6c8…

MALICIOUS

PDF

153.3 KB Created: 2021-03-24 02:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dffd2f2fca1e723d6199366d1943dffc SHA-1: 3c5e9c202bb87b65c9168865a1a49f44f9073c00 SHA-256: 48371e0b5a89f6c8640e33d9933104679d09a7876049151b50d50cdf774cace3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'music time periods unit exam', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://resalured.ru/wix?keyword=music+time+periods+unit+exam PDF link annotation
    • http://saleproducts.pro/92599067440pnu6m.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/16afde6c5.pdfIn PDF document text
    • http://draiwenstore.online/guia_completa_calistenia_gratisc39sb.pdfIn PDF document text
    • http://migriruy.ru/how_to_use_the_clean_washer_cycle_on_electroluxbzgn4.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/KghAch9/45690971389.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/iFigKXC/wuvosof.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/ibgcHR0/95386902911.pdfIn PDF document text
    • http://tibetterrier.ru/29110940141gydva.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/67e400e1c.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/ljdidPH/xenofobimakosedoxibo.pdfIn PDF document text
    • https://todijedesat.weebly.com/uploads/1/3/4/7/134775475/4775051.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/5hehfic/30062524136.pdfIn PDF document text
    • http://adachivia.store/muzavoperajuwonndv5p.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/S1leIul/my_synchrony_rooms_to_go_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/hIigge2/28728364157.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/mitovinusisuzija8l8yq.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/2157144.pdfIn PDF document text
    • http://italysummer.fun/gojataxinerokowaxous20p.pdfIn PDF document text
    • http://fit-italy.space/pemenixuluxubujigerofijuf2y6n.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/0tNij7q/strategic_planning_process_steps_for_nonprofits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_66f87669567944c8b9f0b76d6f3180a3.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_f12a950ea4c44642b53791e99ed098b6.pdf?index=trueIn 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_off00021809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21809 5260 bytes
SHA-256: 1dd9c9dd15abfd3e669d8e8120948e56640857a6ecb015a5c132202566c7a9b8
font_01_sfnt_off000229de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229DE 14552 bytes
SHA-256: e262ffee725353d2eabff4a90943ed27ee315345dcffa8db81ed843305c785d5

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