Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40962e895ccd18c…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 17:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a38b9a02b61df724ba79213b23d60b2f SHA-1: 07ad5bdb8703ff3582b43b8ac9fc716a8caf3cb7 SHA-256: e40962e895ccd18c3302b879e7eccaefa039ec9bf428ed346a6fb3dfbe35a505
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high density of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=selling+dish+network PDF link annotation
    • http://fundacjahfg.pl/upload/file/99538886727.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/popavavefuvanofavupemak.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/xizipug.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/97902085250.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/tugitamakafesonovijogi.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/57738725560.pdfIn PDF document text
    • http://platcometals.com/images/file/39708180026.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/pivujimonopu.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/labez.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/53597296537.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/gividosutopavunal.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/438321311.pdfIn PDF document text
    • http://nature-revive.org/files/file/lafusomakazex.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/mosujavanibapagolori.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/jakilonafemoxibadimuroxip.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/51109377014.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/7126602449.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489a115ffa9---gumitaviwunadupifufabame.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/83755651376.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pigavozumadati.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614275472e1b7---ramamamomajiz.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/86351127627.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_off0000b10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10620 bytes
SHA-256: 42060db54bf0f9336dd6a357b4d59b80b1cbecb4c1c58e8038ce23cfdebf996e
font_02_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 15844 bytes
SHA-256: bdf8eed909a69c831b63a1c6233b2ef52b8d758f092aa6d7c199649e20e7340d