Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65d33bfe6ec7c4b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 14:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: af1e51f72321c9ab10398fb59ba8d9fb SHA-1: a720dd8e37c6a5189d6a97d018ed9d4ad377b7ae SHA-256: c65d33bfe6ec7c4b6443abbcc7bd3b96fc0206436e7f40fb8e84640572932aa0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs pointing to a link farm suggests an attempt to redirect users to malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://recepti.plovdivweek.com/js/ckfinder/userfiles/files/1524932973.pdf In PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/97372119035.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/10535440198.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/pevorinuvezagod.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/togafavosojak.pdfIn PDF document text
    • http://jonme.net/ckupload/files/jolusudelufa.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/tosenigejowakuzivos.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/7490884909.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vajeziwosikupudeti.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/puduxuvaja.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/55717356844.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/33026775357.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zododaboboxojubokowoboda.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109181200581614.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/gakomipal.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/31028210354.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/14434851181.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mobisoxulav.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16116b81b---pifeb.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/66477789736.pdfIn PDF document text
    • http://herve-coiffure.ci/files/jovegofekuxudokotejidiv.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/11721106006.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090903351045.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe2d47df1---11288137145.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/juzofumelowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+record+a+voice+memo+on+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/fusavesovofowe.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 17360 bytes
SHA-256: d52131884b5481caf7e70985e56d68f4418980c9fea5e9369b9567c8d480d605
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 10460 bytes
SHA-256: df49bfca5f7fc6754d325ee30ef70dbb8a16005557d1b028989a5c384cce73f3