Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c5cef54cc8fdf6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 22:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ce2ed9f892ea3ac3b6b954aac36e34c SHA-1: e082b9dd60d9aedf33652ca8d5e62b8b1a854c8b SHA-256: 33c5cef54cc8fdf6c2a34bbeea2a5b8aa1e977a6d10019d2c011cb375dc7c8ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous unknown-reputation URLs extracted. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebabb1ff5---82957539563.pdf In PDF document text
    • https://terrebleue.org/userfiles/file/jipubufakubijirotos.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/rezumoxijugosanotol.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/bujutaveximewofaxiteju.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/53623905144.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bdcda9471---nerigivuwopome.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/82046651384.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/55961204146.pdfIn PDF document text
    • http://rafaelokazakov.com/file/92707158903.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/5859579944.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28741847760.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/27746331075.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/86379874438.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/36357195730.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/poxonutirexabokojekix.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/9525403443.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/masodofun.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/rovegubimilugogezumeloram.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/tewepak.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/38980608015.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/70731601171.pdfIn PDF document text
    • https://virker-ikke.dk/files/vexunusinesid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=idle+wizard+androidPDF 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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 10072 bytes
SHA-256: 700c4374588c46094eea8ce78426ccf3b86f1d363f2b775807656276f3e59bf6
font_02_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 16136 bytes
SHA-256: 1070c1266cee711650be3b93b5122dc52a48ef90f0e9bbf7ce1f60fd1f98c9ab

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