Malicious PDF — malware analysis report

Static analysis result for SHA-256 b714191ab0f6cd4c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 04:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afe045e33ac44744d0999a8aa0635674 SHA-1: b51ddd38973127750220d61f58173aaf2317b3d0 SHA-256: b714191ab0f6cd4c4e205277953b76c441ab96c69b87d0070818f55d9a8be89c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kebecelectrique.com/upload/editor/file/15670707649.pdf In PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202197223532913.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/44776683198.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/daluxaweraxaxaj.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/gemaziwanuratekunalu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/lodabizid.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/60176238071.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xitasasimoxigogurifexav.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xitalod.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109080252051456.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tajusagefuvoletosekelo.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/budibofawureli.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/tuwamatobu.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pekuxufujurenawepajelaz.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a146878fb---31329690794.pdfIn PDF document text
    • https://greenways.at/userfiles/file/45417795742.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/pupafemimemosumuf.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/bovozupoguzitujiketalosi.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/nonomekawusubuf.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15174192749.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/37998950032.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/59333864580.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jujabisifasekufonikano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+giver+book+summary+all+chaptersPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 16780 bytes
SHA-256: 0193271dbe920c2524816df09c3b045da177929fd7d63569c36a7d5e98c4c7d0
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 11192 bytes
SHA-256: b99479ade9288db3febea26cd9f30820e51d50402b423beca82c81ff9d0549e6
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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