Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dd5370460bcea6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 15:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de5a1809d9a590c09aa693cd28f48dc9 SHA-1: 8c2e127fd7fbc5ac72539df10b75e7b019ea1c5a SHA-256: 15dd5370460bcea67b33fa508cb96b598fffaa732583da123aaadf8d73e1339d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or malware distribution attempt. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hanasushipickup.com/uploads/files/zoripu.pdf In PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/39121543978.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d98a1360---nidobusevat.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210913062540.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/8672472573.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wirarokujilijopu.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/8820093189.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/69712576326.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/waxinowewa.pdfIn PDF document text
    • http://pbpharm.com/upload/files/58407915947.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/80486112707.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/bodon.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/68820088093.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370148900a9---52334705084.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/77317897225.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/83786539888.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/57736493518.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/sadaxusivabaka.pdfIn PDF document text
    • https://ka-base.no/images_students/files/luwebulajekuveketomepok.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/zanaxuno.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/33894168168.pdfIn PDF document text
    • http://cosyromania.com/media/file/nebawaxadimo.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/83532000306.pdfIn PDF document text
    • http://e-sportis.com/images/upload/didegav.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/govonogetomaxijamadodanir.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/jadojopijilix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+the+following+angles+into+radianPDF 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_off0000b9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 16548 bytes
SHA-256: 7ad7d5faeac1b0acaea891e9861579956afffadc2695eb646138d2bf72330f41
font_02_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10816 bytes
SHA-256: f56316c04d82b0a00bdb498e93c68a217fb68a942a376de14f914604e4281085