Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ac05681415d902…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 20:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f2caa88a050da286affe8f5dbf7ff46 SHA-1: 5870d8a8ff9a6371aa9d9b4104a289b25d3eb6ff SHA-256: c2ac05681415d902e1e02e1bc2501b83550c822700db92a0fa45514a4d4b30e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains and one identified as a link farm, suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://csam-villepinte.org/uploads/images/file/17788115333.pdf In PDF document text
    • https://jerseyshorepirates.com/userfiles/files/dazobikuso.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/62938222894.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/bararuzezisatize.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/penasubomokunugubipigasu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136331934002---jiwesafixazola.pdfIn PDF document text
    • http://xhzhengli.com/upload/79343264108.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/povuwamaduluwavajobikep.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906225320.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/rejatak.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28731757852.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/sovajozaxakelawamigol.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905080724.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/badekepojupepikemepam.pdfIn PDF document text
    • https://edarky.net/data/file/juzikobo.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lopap.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/30324055728.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/70901876358.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/99035985631.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/savesido.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/dilekuxixixowowidugevaxit.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vomegamutorixeze.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/zemutosasomutemuzaribi.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/25264702589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+file+to+paint+converterPDF 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_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 10512 bytes
SHA-256: 892c4e6360bafb344927e4892c9d56247099fb7574be4814f8eef9e7cef0b780
font_02_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 17212 bytes
SHA-256: 18ce7fab3d12e81a314612c50f0ede647f62378fdc135194a48f5f9a655382b7