Malicious PDF — malware analysis report

Static analysis result for SHA-256 305008b765ade259…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 11:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5eb91355045a72e148e67f3d89197ec7 SHA-1: 2e301661fcfa047fe3d4de6897c018d2a268afe4 SHA-256: 305008b765ade25924a106a5fc11f25db0c6929c94573371a59ee353f7815546
134 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely responsible for executing the exploit or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coebmsf.com/userfiles/file/30894062714.pdf In PDF document text
    • http://esistore.com/userfiles/file/10759050205.pdfIn PDF document text
    • https://nomortiga.com/contents/files/10843495116.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/55329128227.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/88374589075.pdfIn PDF document text
    • http://samtle.net/ckupload/files/muvivelipepixuxawazadedon.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a6ad1fe7---91405873310.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/mudafibujex.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xosivi.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/naveno.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/siteguse.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/86364582979.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/96612517240.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/kijotazin.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/58557005883.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/zuzobujugizesinojedukija.pdfIn PDF document text
    • http://sns.hu/_user/file/detogitukijogojelota.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/84854933174.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/11163648759.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/87115590678.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/71720688196.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rikuzopaxawaretiwes.pdfIn PDF document text
    • http://iucecb.com/files/file/buzinisubusufozet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=accepting+a+teaching+job+offerPDF 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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10796 bytes
SHA-256: 73be29e8b4fe5e3df0aa2f77726f646800218747942e854874d8a3996bdf3522
font_02_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 18176 bytes
SHA-256: a626cf9ee2c97759c685bdfe079c5e4a985634b9fe57b6fdabf15d56a4b941e6

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