Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e6561e27424cf2…

MALICIOUS

PDF

73.6 KB Created: 2021-03-21 11:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 54d0f68c4aafd1a05def37ac78e60871 SHA-1: bebc1de4891e0df6c014bda4c322f3368f68ed17 SHA-256: a8e6561e27424cf2e286781b77a995ea67a6b3a161c4981388096378e10a04c9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=calm+my+anxious+heart+pdf PDF link annotation
    • http://tonojodozif.mypressonline.com/transistor_amplifier_circuit_diagram.pdfIn PDF document text
    • http://fudopanazi.22web.org/bimopugavamukopomivajimal.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/astronomy_today_5th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/gsjgpzN/revenge_of_the_gangrenous_finger.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/esmo_guidelines_hodgkin_lymphoma.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/dhhELzU/red_lobster_biscuits_gluten_free.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/human_biology_college_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/hiHgdOe/5683382797.pdfIn PDF document text
    • http://mubarominufu.iblogger.org/23926220041.pdfIn PDF document text
    • http://lumosawinulogu.iblogger.org/vezumalirisalesepise.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/93285978271.pdfIn PDF document text
    • http://vibawukukar.iblogger.org/67527720669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_fda00e7931454d668fc8572f4f4d18de.pdf?index=trueIn PDF document text
    • http://mudotepejix.epizy.com/nouns_and_articles_in_spanish_worksheet.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_cac301be949b41b1a660807fdb2c4ed8.pdf?index=trueIn PDF document text
    • http://kirigawegugava.epizy.com/b_c_center_song.pdfIn PDF document text
    • http://fagugawuw.epizy.com/puvuxes.pdfIn PDF document text
    • http://daxevetefixidaj.epizy.com/98222813618.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_5f531ecaca59471386f13cc50540132a.pdf?index=trueIn PDF document text
    • http://buxamojajowolos.rf.gd/sony_bravia_tv_manual_reset.pdfIn PDF document text
    • http://dixasobif.epizy.com/polaris_360_pool_cleaner_installation.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_3d398bab5a6145f29cc8e7c7e5bd97b1.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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 5356 bytes
SHA-256: e4c9c8cf46a5adaebfe886ddc7376d1a354f2560240bc92e90b37618134a5847
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10608 bytes
SHA-256: 606f0b4463d7c0c2d3f5054db970c9e2ebc7db1d9c10ea3ff4aeaffef0579b56

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