Malicious PDF — malware analysis report

Static analysis result for SHA-256 316cfd95e68b321d…

MALICIOUS

PDF

87.8 KB Created: 2021-10-05 00:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 002b1fd494927bce3f71475f4962ecf8 SHA-1: 8c3855939c71d332f883c33f39defc70aba9ed2a SHA-256: 316cfd95e68b321da8e2bda1e5572a1a3b9265e813d53e88cd76066bd302b92c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=my+town+friends+house+apk PDF link annotation
    • https://karaari.leaddeehub.com/userfiles/files/60551714311.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/fexupukatew.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/wesaxopekavif.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109152046204563.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/42256139233.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/70932275585.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210916160606.pdfIn PDF document text
    • http://egitara.com/upfiles/files/momopenejonew.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/fejoxiguwetijemebeguzarix.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/wesawiz.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/39702160037.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/tuguzapoxifovaxuveb.pdfIn PDF document text
    • http://xn-----6kcftbqgtghjv5bf5gydg7b.xn--p1ai/files/files/pifakadonokag.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e7b70840---jafexijifajozun.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/relademav.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/defisis.pdfIn PDF document text
    • https://braus.uz/images/shared/file/bofixixogemi.pdfIn PDF document text
    • https://almavilag.hu/files/files/80448724627.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/wudurulusa.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/zitav.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/54750168506.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/89713855008.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/5394679818.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kaviz.pdfIn PDF document text
    • 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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 18884 bytes
SHA-256: 0f50aaf594660ede7e1bdadd3439c739fcb97f58945b556f6739a103ae6e26a8
font_02_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 10932 bytes
SHA-256: 8a7d7d82432e4e0e2ad85e034582f63fc37593ed28f7e5acb24d6f7dfc716a69

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