Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5ef91b9aa8fc06…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 07:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ccdfd36b4ea1eb472e2ef2391df5e7c SHA-1: 9bec33ae95162f6ddc04e900c528fcd5ebb548a0 SHA-256: 1e5ef91b9aa8fc06d829bbc9440fb8216539a5fde2691802b10bda027930694f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a disguised manual, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=t+maxx+2.5+assembly+manual PDF link annotation
    • http://gloslides.com/87983519741v5se6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_6039cdf699580.pdfIn PDF document text
    • http://sputnews.com/mhra_guidelines_for_computer_system_validationbfrui.pdfIn PDF document text
    • http://noxivivixuza.22web.org/sosonisig.pdfIn PDF document text
    • http://ekzo-fruit.ru/potion_of_barkskin283yw.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/7909979.pdfIn PDF document text
    • http://usacreditreport.info/what_are_the_6_major_early_civilizationsr876v.pdfIn PDF document text
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/tidusuf.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/debit_credit_accounting_excel_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_60532ca303ec2.pdfIn PDF document text
    • http://it50disconto.info/52054354818pwysz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_604cf0136c298.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/mojutowejumixaralsghg.pdfIn PDF document text
    • http://heleogose.online/59600345246486gl.pdfIn PDF document text
    • http://leyloften.online/modijegiwifagivavuveroguwqeqh.pdfIn PDF document text
    • http://khanapoorti.com/actuarial_mathematics_textbookftj65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_6043cc8659fa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemefidapuwemo.rf.gd/6999348419.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/contoh_surat_permohonan_pencairan_dana_bop_paud.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/newatexanolip.pdfIn PDF document text
    • http://vezavajizuvos.epizy.com/zojirushi_bread_machine_manual_bb-hac10.pdfIn PDF document text
    • http://bipipofagikoma.rf.gd/average_age_of_death_for_homeless_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/14518987214.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/77716620029.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_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 5284 bytes
SHA-256: c904124cf2dd75575e7e293b59d48fa9e5b99629f68ba619cb7c091605899545
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 11536 bytes
SHA-256: 6ed1b30aaa14d1b279ef1096d4260749eb98f0f888e7c774df0d77438ebbce8c

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