Malicious PDF — malware analysis report

Static analysis result for SHA-256 025a3473e8b11ce5…

MALICIOUS

PDF

88.3 KB Created: 2021-04-05 07:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4637dc0c110e95f2647898dab57c4f4 SHA-1: b221fbfa626f5073c09976b7f46cebe6d2b83914 SHA-256: 025a3473e8b11ce5108f0b39df16c008d4c9e226b989b2a73fdae4157f0207a8
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing pages, and the PDF structure itself is designed to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7740

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
  • 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
  • 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://kuzutuzo.ru/strik?utm_term=al%2528h2o%25296+3%252B+name
    • http://cmbmarketing.agency/viliwexus8tn12.pdf
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/wavij.pdf
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/jutesek-ledegap-fomuvizisaba.pdf
    • https://cdn.sqhk.co/rapawomo/tiihbrr/wanawalaxivorepi.pdf
    • https://cdn.sqhk.co/fuxuduxexi/dQvjbKm/15641640131.pdf
    • http://dokumenty-kiev.online/zikunelosatazaf60o2v.pdf
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/6223955.pdf
    • https://cdn.sqhk.co/gufemazibafi/RGAhfgW/sagidexejefunafa.pdf
    • http://wexypay.icu/482933622797v03x.pdf
    • http://milanomodaitaly.site/347627741671ytbx.pdf
    • http://tur8osale.site/bolimesuviregesosekek44xyc.pdf
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/680855fa5bc649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_768ac301bc5642db8aad11db3fdf68e0.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_5bcf1bc1739a4cd0b84b554e106d672f.pdf?index=true
    • http://bizepusozuj.epizy.com/heritage_building_information_modelling.pdf
    • http://botodivezegi.rf.gd/35711816296.pdf
    • http://lodaxiku.rf.gd/allah_waariyan_song_free.pdf
    • http://jewexaruwibel.rf.gd/japuvorevumamevufosoxik.pdf
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_388503d949ae465087c13d0d1fbab384.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_e68d1d9b030341a098607a539066bfca.pdf?index=true
    • http://zomusuxine.rf.gd/supreme_commander_2_unit_guide.pdf
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_6d14b79cabc44ca182eaf4dea9dc4da2.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c61.bin
3417a8472b992d7956e85e423695af052070b76ea8b7b274fbda2f48a80c1027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 5244 bytes

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