Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781c2fc022a489c…

MALICIOUS

PDF

114.0 KB Created: 2021-03-29 23:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3aac4420a906767b7c06f1fbadac5742 SHA-1: b27a946f8e7d6bf0b2e951cb12dfb4d234c05101 SHA-256: 4781c2fc022a489cb0b061af7308dbe0aa7588a6ce539e12acdde5038be21ede
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to 'soxebez.ru', suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://soxebez.ru/wix?keyword=binomial+multiplication+%2528foil%2529+worksheet PDF link annotation
    • https://fuvukajewub.weebly.com/uploads/1/3/3/9/133999399/najarudedegorigamoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_603343d612853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453118/normal_5fe3b9462c8a2.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/bose_321_gs_series_ii_specs.pdfIn PDF document text
    • http://zudazejugimup.iblogger.org/byzantine_fault_tolerance.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/1063367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_60414bd280a59.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/alimentos_con_proteinas_de_alto_valor_biologico.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/barosoragewen-bowojaxu-zigiwipobe.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/ziwizoxisiw.pdfIn PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/90a0cfc.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/dodopof_rixol_deripogem_dunugosobumur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_603eea7ec1bd5.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/7500899.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/latulaw.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/berger_paints_price_list_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c813036f-a8d8-4eef-a0c9-29988cb95385/how_to_get_google_search_bar_on_iphone_home_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad62592f-8d89-41d1-b40d-2e116af6c508/razijopuzozutitojunezifav.pdfIn PDF document text
    • http://verokobipota.epizy.com/relulefagodubuditesa.pdfIn PDF document text
    • http://zeladupu.epizy.com/basic_interpersonal_communication_skills.pdfIn PDF document text
    • http://kasamirekajitid.epizy.com/raquitismo_articulos.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 7112 bytes
SHA-256: b4f037faafa4008964da0672952a57674906bb93b1a6259558d8ff63128a809f
font_01_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 3820 bytes
SHA-256: 3df030e45e006708a1f6d75b3accb999602a3965e19588d89c52ca52cc782a38
font_02_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 5612 bytes
SHA-256: 5be23b19959dd2a15ca538b574fa6930b26b02a40fbabbbd7c4406277a2b3430
font_03_sfnt_off00015855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15855 17180 bytes
SHA-256: e3ef777575a83de07175705858f664fbe1b220f5550d6fe3bf599cca339fb8e5
font_04_sfnt_off00018fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB3 16996 bytes
SHA-256: 0ed23aba2caaa89d07f7b26c0d4bdf208d001451d1f5aaabfeb01a19c1230318
font_05_sfnt_off0001a825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A825 6064 bytes
SHA-256: e32b649d2fca9fa0c7c132183b366f5bc91b3e3fa9acd1ae5ecb01bbcc276f87

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