Malicious PDF — malware analysis report

Static analysis result for SHA-256 350bc27b51417bd1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 13:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d98b97367af794ba2f215c2ac02e817c SHA-1: dba20c1539ea95ae7c2412f385d25078c8a5d77b SHA-256: 350bc27b51417bd1115ec8661030e181e2a33ae22427b22263c318460dcbd507
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=sudoku+solver+apk PDF link annotation
    • https://labelmarket.eu/data/file/rumirivutavibu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/xibowidajudevuzo.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/7383327446.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/74430874007.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/fonufawivuja.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/pajexitoto.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55662378638.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/890836835.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/lodazelunusaxover.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/lilebisosifoxaguwijuderu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/xopotari.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/bovexonatenudinami.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071053051966.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/rawifelekujegumi.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pixumizuwozepebamedifeb.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/65411491665.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909111149.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/19588336671.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/287556505.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/tijimosame.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/99835737522.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a2841760d---73540090004.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/ganajironepukinedokule.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/gaxubelatadekeboresaruxu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/55950000553.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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 18936 bytes
SHA-256: 227c7f279f7c0e4f3a1fea16d4e138374d0e966b6aef0dc258b28289c9564e0a
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10424 bytes
SHA-256: c591fd838af9c22c1cea4496d2c996a30017a102310d789060b9409fd3d60902
font_02_sfnt_off00011d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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