Malicious PDF — malware analysis report

Static analysis result for SHA-256 079b31ba135c005e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 11:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38473cd7d567ecd61f5118ec293e1275 SHA-1: 48b5fb858c03666cadba17e47968cf228b0ba262 SHA-256: 079b31ba135c005e7476d8354fc9ec58f9c6ab56bc04f2f92f0c6cde51f11236
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions. It also features numerous external URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

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 http://wccflooring.com/userfiles/files/vogijulesoliluteveju.pdf In PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/39681064174.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/siguguzinoguvorefijuxak.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a6a93609415039e8e36ecd0ec145b7d4/rolozoworigogumezujo.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/velilewe.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32967656051.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/91621600169.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/zapem.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/rikikinapuwuwufepilopeliv.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_040037.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/92633164728.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139e981a2fdb---xugarigiberi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96717829520.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/detob.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/54017205673.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/2412965577.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/wuzoleniwodinejewazo.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/27052738385.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tekumuvinuwajedafumoge.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/95455971642.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/zumez.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/61336422246.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909175418_742089906.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/39083782330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=enterprise+energy+jobsPDF link annotation
    • 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10584 bytes
SHA-256: 876830cdeb507815f5d48867766eb636e804bc41a33429c262e241e6681c2eb7
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16776 bytes
SHA-256: 18729641038769e36d63b543d36b99797841a59aae0d3dd4216a12bd6ae2e8c9