Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf8d8c201c6b9dd…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 374aefce008f660b9999373debdfd3f8 SHA-1: d4be9905f4480f85d8cf279cb782ce9fd7da415a SHA-256: ccf8d8c201c6b9dd56c19ce280df3969bc02b2ff4aadab4b405fcaeb0201f332
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, indicates a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://28777886.com/Lpf/UPFILE/userfiles/files/penupuromof.pdf In PDF document text
    • http://leicesterbiketec.com/userfiles/file/zusivoxabebapevime.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/zabizawuxojunasogokebive.pdfIn PDF document text
    • https://mediaskills.rs/files/fipifamu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///faxuwataxumewobevuporojuw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135bac131ee2---49720703847.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/61253344331.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/nekobivudapubi.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/25435463981.pdfIn PDF document text
    • http://sentai.cc/data/file/20210907_165034_197.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/zabazufokeb.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/jimewe.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/9939935651.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210910_171017.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/8290253817.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210916/2109160538007928256u5m2v2h294v.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xuwonuwubudaroduridojifo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163125414231.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/fewaf.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fasovojukot.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xovefobas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fifa+21+apk+download+offlinePDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/xubig.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_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 18036 bytes
SHA-256: 32508aa4ba80c3d2ac6906116ccc905b944844a2ab399b3ce76b89503fd507e2
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10452 bytes
SHA-256: 3235b49c5f6421c13677f33e5939b1b6ddc2049f64a631a36c6f5456f61f1e5b
font_02_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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