Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32e77cab5b3ba36…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 20:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beae96df56d843b12337db8e03f2bed8 SHA-1: e53b2dcad270831c4a5d43c4e2c30498b034033a SHA-256: e32e77cab5b3ba369759ff2f9ee10d0fa4db12699b1b38a27dedc4aeb9f4f3d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://studiotecnicobonoli.com/userfiles/files/dibafemuxe.pdf In PDF document text
    • https://e-uchebnici.com/img/file/jibugotewazurave.pdfIn PDF document text
    • https://digireg.com/upload/90743427841.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/56565277025.pdfIn PDF document text
    • http://dztechfin.com/upload/file///sosejenelezumapolubi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bixomazi.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/vatorugab.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/20291900385.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909023518466531.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/gudurupupasagup.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gilagiladij.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/lerezivomomofiso.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613590bc930ef---34772470461.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/49620377345.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5425557255.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/movubokunotolonebos.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/81005783604.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/negatibubunokuvufexovusi.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/vudonifiki.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/mobizumosutibukuxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=diner+dash+apk+full+versionPDF 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_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 19876 bytes
SHA-256: cb8f0253744da34d9915fc0c38319335dd0bf9872d3afebe8e8777ea2ed6d3f7
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 10756 bytes
SHA-256: 9f65c9d8b44cc490cec9837367b80f37eed64070c5225df1e5104160957c40aa
font_02_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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