Malicious PDF — malware analysis report

Static analysis result for SHA-256 e333fb252c259b03…

MALICIOUS

PDF

77.9 KB Created: 2021-10-13 02:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1588f2f5e075c0c97426624727ddfab3 SHA-1: ebdabcb5d7b05c6703b2959ba92ae5044618a264 SHA-256: e333fb252c259b035ed69390b78a59604ce70c4c63fa19f3c9d92f3ea26a9ff7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=what+is+the+square+root+of+532 PDF link annotation
    • https://triangle-electronics.com/assets/userfiles/file/valisoku.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/66599661490.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/14118197285.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/raledimupokeralop.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/79134955118.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ljDvWKG8UHL602IM.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/16025868036.pdfIn PDF document text
    • http://leguido.net/files/pitidejeka.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/mizudere.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/29310979304.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/93307662998.pdfIn PDF document text
    • http://195exim.com/datas/files/nodimufobolaso.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/subajeseb.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/levagafurudib.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/75615609197.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/35412112467.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pologifanozadimobotogas.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/19086394263.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202110100244417930.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/69942206032.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f5c1e2cc87---54944723313.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dunujigodopujodamipil.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/kejake.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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 10824 bytes
SHA-256: fc5f847bdb9625c45d3e080438ed0c9a82b03f21dc43dc458005c50785c302b4
font_01_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 19436 bytes
SHA-256: 87dff10ff0f4f4f4e93bf9ebab0f540774c1aaf614e15153d992c2c872313cdb
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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