Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cb255dda919749…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 09:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eedd5b5480ccf004e613fae696553a9b SHA-1: 066ee3dabec7d84255a57c2c4e5c9760a60bcda3 SHA-256: 18cb255dda9197499fc7297f6f834cb17ea1b3804e16b02e5f228790913eac98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it functions as a link farm, directing users to various disposable domains, which is a common tactic for phishing or distributing further malware. The embedded JavaScript likely facilitates the redirection or exploitation process.

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 https://inwebjor.ru/uplcv?utm_term=8+ball+pool+cash+trick PDF link annotation
    • https://buzyhub.com/files/foxudopapal.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e234544914---28326118555.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/66626709781.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/86878245224.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/57564949746.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/983051525.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/kajediwebinipafobog.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109070304089589.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/10693945890.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/tatugetonimefiseturopa.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/rijexidozapap.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/kojojife.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/64832847612.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/depusajus.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/69430139730.pdfIn PDF document text
    • http://cocoal.com/uploads/file/73426246269.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/67048056921.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11948301232.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/woxovopakotuzudarerola.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/betatesojiza.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/kuriwijure.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/42531244815.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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 20108 bytes
SHA-256: f16535dc6dd18df74465463b5ccb635e387f68d1624e47f5f91e6e1e6b78db3a
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350D 10576 bytes
SHA-256: a6a9c6e7170fe56c7d6426447efe4017f13081f313d5d52185cd926d9afca676

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