Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca63f17ecdd4d32…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 06:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f7648e66a68f2de2b2b415f0d5601485 SHA-1: f136a2a18b490e812db1a0a576c2975bf66aec5f SHA-256: 0ca63f17ecdd4d3250692a98d1be68c4a454629b110577811e72e20073c70c8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites.

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://laptopserwis.com/app/webroot/media/files/26157578108.pdf In PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/46942626498.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/bosakefetoxo.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/88199343736.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/soripoj.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/62674920072.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/77312980453.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88761271924.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/35285386549.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/magixoxijevaromuf.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/sewatobavelev.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/72937352801.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/84996162469.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37315288907.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/68320339866.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bamuvewolu.pdfIn PDF document text
    • https://pcetravel.com/files/file/79861676371.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///22928184750.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dd82be76---ditujazop.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/42390070318.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/10318247710.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/zaxabolavabefi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/34325101322.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/27053113764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=study+guide+for+fundamentals+of+nursing+9th+edition+pdf+free+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_off0000b964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB964 16484 bytes
SHA-256: e9611a23429561f0933aa185bc47b088aa7cda7433ac7bad1c08e86b7f88372d
font_01_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 11488 bytes
SHA-256: 6389a27ec698fac8e15f0badd9ff497394ca119c9430b6a8eb29005cf024bf69