Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da68105bb200331…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 06:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fe103eb1c94630bb4e28bbbcd5879c2 SHA-1: db57ce966b5e148864b2542e4664bb14892f4c40 SHA-256: 8da68105bb20033121b7313fb0c17449ef50dd9eef7aecff894cbd006618ecaa
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and a high number of external URIs, many of which point to potentially malicious or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to various external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paklya.su/design/img/upload/file/wagixo.pdf In PDF document text
    • http://ranjitabiswas.com/userfiles/files/sejibuxom.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/11255315468.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/givogukelexudavaxomej.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/novezurezopumorepi.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/51262533757.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/14745994376.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/66682018791.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/jorokapubinifiborakekiniz.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/55767876182.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/87486067111.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/45788890533.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/32778944408.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/66796883175.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243b9278f3---xobalita.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/towutozefewaw.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/towexawiruxazejam.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/20860949935.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nepijakipugoxexin.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/ruwejanudogiwero.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/49083469873.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912060232805974.pdfIn PDF document text
    • https://suruburi.net/mm/file/11411729104.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/24636616810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+get+to+trash+on+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/vekotivozositifijobowu.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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 17924 bytes
SHA-256: 43915313e0ffce4897c0a91e5591b73aa2dc42371f28ef96dec0165741fc879e
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10772 bytes
SHA-256: 34229c53451a9d4d8951330396dc8c15a2f9f52cf52e2e8d68b39b9816e848bd