Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ff6c57d61eeaf3…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 10:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a0c38ae9432586ef6e00f1a3e76c2e9 SHA-1: 73161ea9dff554381cb44da9ec818df3e1076384 SHA-256: 33ff6c57d61eeaf31df6980a2ec617d2031141f066ffe4d2e47c8605e3537335
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of numerous unknown reputation URLs suggest a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://deesudcoolingtower.com/userfiles/file/88174699344.pdf In PDF document text
    • https://monyetjoget.com/contents/files/5733164651.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/70428148167.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/buzorejavezexoke.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/94653974060.pdfIn PDF document text
    • http://artospace.com/pics/file/demidubikipabix.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/42685087513.pdfIn PDF document text
    • http://gr-chem.com/upload/files/42429501230.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/95394939711.pdfIn PDF document text
    • http://specialcats.nl/media/files/55366007403.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/937613172.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/85000702887.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/85430281767.pdfIn PDF document text
    • http://bankerz.in/qpic/files/67232162730.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4a2a2585---48190420268.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/22031843010.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/4908568677.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/94178107620.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/63874265667.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4e02ee82---zutedepozofuxara.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/92190635426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+do+a+fake+video+call+on+hangoutPDF 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_off0000b86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86E 10820 bytes
SHA-256: f1784f71c1a159aa068cebdc3edc17bc44bc9662454be6920f79eaeaa0482d25
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 15728 bytes
SHA-256: 78e0d6924dc9aee0386b49375087d1a28ad874f5b024e6ad5cf135c9abc3c7eb
font_02_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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