Malicious PDF — malware analysis report

Static analysis result for SHA-256 316d148110172035…

MALICIOUS

PDF

71.6 KB Created: 2021-10-09 12:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1b39ab05847dd9eb275972ccf69be36a SHA-1: 24e23eabb20b03019cfd78e82cba7b717e58bd20 SHA-256: 316d1481101720353562b572c4d59d57bcbaea24d912b9185080f86a8990e3f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on 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 executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=critique+of+structural+functionalism PDF link annotation
    • https://srmhomes.com/images/bulk_images/files/nubetikasimatifada.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/guxiralaredelejevefuvalo.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jowezopevuvozisozi.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/84835626079.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/10609484333.pdfIn PDF document text
    • https://mar3ol.com/Files/files/81246607548.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/fudurubevorukuta.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/61331681838.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/34945906503.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/62152817709.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e23c2c765c---1545222863.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/ruwefesonevabiteko.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/88881521832.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sigasenopuloro.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/37100207116.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/fowadiwi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21458941286.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/selaluvuvaludarufet.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/rasuripemuv.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/vawovisezo.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/73851553048.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/83422523835.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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 16300 bytes
SHA-256: 0d5f22ee7f6e0c1b52d94b148283f09dc1cfadcca4409b26aaa8f6037e36c079
font_02_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 10772 bytes
SHA-256: afe84f1929fae1a6dc7d97943dff360bd8aff02c5942a7feb93c1692ec365006

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