Malicious PDF — malware analysis report

Static analysis result for SHA-256 d352cf8e7e5d7ed4…

MALICIOUS

PDF

69.1 KB Created: 2021-09-19 13:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc9373a1dbc98f3a377eea7476ae982d SHA-1: 433d3ca4ce2544b1283e1fe2c18173978cb1d81c SHA-256: d352cf8e7e5d7ed460dbbab58f33f1daa6c7ba1aebe00f6afcbd9c64f984ad57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that explicitly mentions 'block downloads android'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests it is used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://infrive.ru/uplcv?utm_term=block+downloads+android PDF link annotation
    • https://reaga.net/js/ckfinder/userfiles/files/tukawepunikesokawi.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/30502172314.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/38814643102.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8e74edcf0ef03423312a17f4608722fe/rataweb.pdfIn PDF document text
    • https://yellowstonewildlife.com/pifunikalukikosux.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/zagumera.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/guwusujakoj.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/30443536241.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kodebukewewokevobatote.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583b3247f7---dufota.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/dakedabomimadezapejoduso.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewezajivosupazumisawuw.pdfIn PDF document text
    • http://effektfilm.de/files/file/majivoxozegat.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/lisubegobutikogemunuvutod.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/11573712047.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xozirajiweburuxisovusolo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/82332852342.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/54148613622.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/vipezinosepukupenad.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/77010215315.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091521502293.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/debudumovi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/14492477339.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/56944707256.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/41550422995.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/23939566747.pdfIn PDF document text
    • https://birotex.rs/images/files/25520849334.pdfIn PDF document text
    • http://yuha.be/_files/file/pewazosapoj.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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 10364 bytes
SHA-256: 97c6460b9c66a6fb8205a094de4230d1853366eaa36a6846a16eb91beca53341
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 14300 bytes
SHA-256: f3ae20a38e3263bdf4b401362daa4c7f5064fe0d328766ea2d59009867917c2c
font_02_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1