Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1813243060e24e…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 07:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97fc88a412352f2aa45b0a2b25bf42bc SHA-1: d937388519195f4a5c9c44cc5220557abf967ab2 SHA-256: ee1813243060e24e7314d9232521a9eab063ddd870f655d8fe22815e59a167b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external links. The primary external URL observed is 'https://jacksth.ru/award?keyword=affidavit+of+eligibility+of+marriage+canada+pdf', which is likely a lure. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or malicious intent. No scripts were extracted, but the presence of external links and the phishing detection strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=affidavit+of+eligibility+of+marriage+canada+pdf
    • https://cdn.sqhk.co/wefopijupe/c7qnjie/weather_live_map_pakistan.pdf
    • http://vumajuzatijerak.getenjoyment.net/mcgraw_hill_3rd_grade_math_book.pdf
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdf
    • http://didezidise.22web.org/ash_wednesday_fasting_guidelines.pdf
    • https://cdn.sqhk.co/fofodafexadu/jnihwV7/94550722588.pdf
    • http://sosogemizibu.mypressonline.com/acacia_auriculiformis_medicinal_uses.pdf
    • http://fisoxovazesenam.iblogger.org/arun_sharma_data_interpretation.pdf
    • https://cdn-cms.f-static.net/uploads/4428083/normal_603ecd35519dd.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5fe990ef456c8.pdf
    • https://cdn-cms.f-static.net/uploads/4415519/normal_603a428768efd.pdf
    • https://cdn.sqhk.co/vefapatape/ii4mggB/21124418668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zopetudivukuka.rf.gd/learn_english_books_for_beginners.pdf
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_94a7f6d200c9415590e4502e7e70008f.pdf?index=true
    • http://kuwoguki.epizy.com/39058756472.pdf
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_971cce21b9ac4a8b909c0f5952c49ca8.pdf?index=true
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_4de61e293d274a449a21b4ef59706872.pdf?index=true
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_0261427deea8420b9132b109baffe050.pdf?index=true
    • http://dorizoki.rf.gd/worshipping_false_gods_arun_shourie.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_5e6270cae3344b9e9a3a679d923ccac3.pdf?index=true
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_4b11a1a8378040d196e86c54b62c1047.pdf?index=true
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_f1aeff6adb4d409aacd1e1ac039deebf.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_off0000e876.bin
ed379b8ece8a85a045c07811e772cbeddb071fc5dc429d75b742cd8642d42777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5588 bytes
font_01_sfnt_off0000fb7e.bin
ec62392f371e3eed6388026218196788a90ca11107c7de5b7dc0c1335082b88c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10416 bytes

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