Malicious PDF — malware analysis report

Static analysis result for SHA-256 16178f6fe26e5894…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 14:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70199a21bd3527639453f71c8f3f3631 SHA-1: 74650e5991a1b3e5b699e694db9718038984e904 SHA-256: 16178f6fe26e5894912d84b833ca530c7d8d598e642300efcf5b66827dbed0ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://chonburi33.com/userfiles/file/44627598189.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee89b7eb92---14916400437.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/ravetowebiruluvu.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/manilupitoturufejemukag.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/61810711347.pdfIn PDF document text
    • http://hongdacable.com/d/files/runisuxo.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/fewedu.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/kejukatave.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99bfedc3f---rilonumij.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/lanujepufisosijepix.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/bofaduxo.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/1834129704.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/85457416753.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/kifavinonaboti.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/xujeziraf.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/88932295096.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jumejizop.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/11420373041.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gexararipifibufaromajag.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/xobedegu.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/tarotilajerotutegorupa.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/24726396037.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/44738344686.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/19010802938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lyrebird+studio+apkPDF 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_off0000bf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 10640 bytes
SHA-256: 6e8c523e0abd71b77083ef4e4096dc0c35f060fa483fccfad770c2f87fdb201b
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 17052 bytes
SHA-256: 2ea0ed1b0ce55b9574eb5de22d9e59712bc3e28aa89529c38ad0e37fb7a9808a
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1