Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbd18d5c64edebd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 00:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbf089f8e6cb96ce963f105e928c2ea5 SHA-1: 4abf0fee0a108605099d32e3205e51b87663c913 SHA-256: ecbd18d5c64edebd4c1b1d5718fc3a6420fa040c86f97037e7541f43cc0eecbb
134 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eltprof.ru/userfiles/file/gaxegufusazolox.pdf In PDF document text
    • http://tagsu.com/attachments/fckattachments/file/konexekokaruni.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/67258082788.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/89998875758.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/34780280323.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/nilan.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/55f15ccfda93984f506d1380bcc908c9/19916472839.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/82099043301.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210916051724818.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/26179712098.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/94469332228.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/17744618237.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zigufekavaviwelijijujene.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f9eaf942ac25f03b0cceecdb2603a223/63276057451.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/64220621983.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43855227695.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/76047817736.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/48370241431.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/tutineku.pdfIn PDF document text
    • http://idcla.net/upload/files/12915168621.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/12773002589.pdfIn PDF document text
    • https://asiapharma.la/files/files/dukiwofisofexowaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=att+apn+for+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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 10128 bytes
SHA-256: c2183871d425e4036ec85e80b25c72e74c19a6df9e9d9235c633bb0162153b5c
font_01_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 19396 bytes
SHA-256: f43052a9210926f83475a0842ef991d9db4d25e04628e407aca3baa174dfbee9
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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