Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e07edda9b93beb1…

MALICIOUS

PDF

66.9 KB Created: 2021-09-23 09:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddbe871d5f5949c0c4ee88b04960b1e1 SHA-1: 24791d73757c5e5579a06bb5bbee5501968b8c59 SHA-256: 0e07edda9b93beb1983b2ea4d104651e2c24037e8e7678a9367782a3c941be0f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://boilerservis.ru/uploads/files/sufesotuxevotuzo.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/jefuwokisofuvobanat.pdfIn PDF document text
    • http://goref.ru/files/file/tadajaful.pdfIn PDF document text
    • https://jjpremiers.com/files/gulibatikizu.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/91514306280.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa8f0ef66---13040010949.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/roluf.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/mivodokuwumipiwetakal.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/64342854708.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/zinasejuda.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/85725919810.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqp5upobb95hknv3qrdk6nbf60/kurijededulozow.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/19462047554.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091109532273499.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/87767950147.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/mavaru.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/31871884033.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_B503B74536BA7175.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/pededami.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/39124454838.pdfIn PDF document text
    • http://dobermanncz.eu/files/fomaxaguwademi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+new+ringtones+on+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_off0000ab81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 14148 bytes
SHA-256: 4f30b27848fe77164ccddaabec52f6c890c4d597493e1223c3ab3953550fd112
font_02_sfnt_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 10500 bytes
SHA-256: 18cc784c214d8e9abb606fb1bd7418558748f2635b2ede46213694f16ff77a43

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