Malicious PDF — malware analysis report

Static analysis result for SHA-256 d181dca73f42a0da…

MALICIOUS

PDF

72.6 KB Created: 2021-10-08 13:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7c33eaae31b564bec9e458bf8833a8d SHA-1: 27df9624dfa0e09718a02865d43239cb32279aec SHA-256: d181dca73f42a0da82f65fd1f5ce16133998de6a0bc72c69a059c3a65bf8a888
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV. It contains numerous embedded URLs pointing to PDF files hosted on various domains, indicating a link farm likely used for phishing or distributing further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mondoacquapiscine.com/userfiles/files/pivitadosiguw.pdf In PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/48721795612.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/62884337065.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/73877952626.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/dopifukazexewale.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/46163841454.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/fivobafomikali.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/rawasumugo.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/ragisulawedejin.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/62557701849.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/88669757849.pdfIn PDF document text
    • http://specimport.by/files/files/9081220218.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/pekuzuzelul.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/4190112999.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/rabosaget.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/vulas.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161373fa56972d---tofurelapi.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77865537913.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0ed1abf2---voxuzafon.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/nawijag.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/pilopujo.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/wuzutugomoxitigez.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/parufa.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/54095590546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=meaning+of+the+word+wittyPDF 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_off0000b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 10612 bytes
SHA-256: 4a48e285ec5e5719ade1a490bbd0c6781a03cb0d11557895d37c476d3484925f
font_02_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 16920 bytes
SHA-256: ca97a8c240b3dbf7c4263c78ff6707f0e141e5cc75377a267263aafe7d72fab6

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