Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf20f5358cbf5b0a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 11:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6afeecd08d79406a3e67985d2c08eac SHA-1: 0b0480dce06b5a486c99c0c1616e4c55eba4cdc4 SHA-256: bf20f5358cbf5b0a8e5afb9b89764670b8104504dad86c630df28babe6ff6917
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. 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 0.9954

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://pixomot.ru/uplcv?utm_term=como+formatear+un+samsung+galaxy+ace+2 PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/gunexetajolugisokazigemal.pdfIn PDF document text
    • http://kechengchem.com/upload/files/727896718.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/sowopanotekobo.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gitelixizi.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/xevudewotedivud.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/64642490249.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/zegen.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/1634394612.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/15875568062.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/25861277892.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/firajegijomimakizuso.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/3786858960.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/11951829487.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/josazaposogadasojarejotib.pdfIn PDF document text
    • https://fond.ru/userfiles/file/72795858541.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7fca0a09---kanezagonedufewu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/45956723089.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ragatanekafogaxedarofegem.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/sefarolizumipusawan.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/57435180564.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/88913271391.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/79490951306.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/45095119926.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_off0000adfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 14672 bytes
SHA-256: d7f930797a58459b94217988a2211b2afb77854a8bd40b76d5b9eda6be475737
font_01_sfnt_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 11052 bytes
SHA-256: 391473b1a19142ff3208df38c029b673c7f3782c316c5ed97993b16832a9c38e