Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c499dbf296fe298…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 14:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51bbbf6f86d7f577aafe649cd9d20318 SHA-1: c31461889356a153903fc033574bae08abda13d4 SHA-256: 4c499dbf296fe298d4fc6fc802033f7062bb87874fda7d416ca5102ed46f2c14
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 potentially malicious or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is likely used to facilitate the redirection or download process.

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 http://mispuntossaga.com/campannas/file/49821715484.pdf In PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/21767702929.pdfIn PDF document text
    • http://oris-am.com/editor_up/92074211710.pdfIn PDF document text
    • https://tivicom.vn/upload/files/tojor.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910215245.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dad403c2---dovazugizaj.pdfIn PDF document text
    • https://wittnebel.dk/file/75133030583.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/57957929724.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fizaru.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/75305414026.pdfIn PDF document text
    • https://irrisyst.eu/files/file/sameza.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kuwidezejo.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fopokogireg.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/mixoronukozexup.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/mebilufo.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/valumeveso.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/levixitabuvopeli.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/46304207845.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/55536108418.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/11204057904.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/jewotimoxamu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/tikakozebewub.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/70684307174.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/pubexikezukonepefigajim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=resident+evil+6+apk+android+downloadPDF 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_off0000c293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC293 10844 bytes
SHA-256: 6bd54a503791beb55fb1d75930d06d09401cd8d6028f8b5c555cc7a5a5fb1023
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 17108 bytes
SHA-256: c36823dc2f6319b3e40a320a771e03a0c6237bad077567a0ed44e66e17acf30a
font_02_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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