Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6325150437ce26…

MALICIOUS

PDF

72.6 KB Created: 2021-09-22 10:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e65d9815f1f94f88005a7619828023de SHA-1: 899dc6f9a144e4489dc820f5710627652ad86ee9 SHA-256: cd6325150437ce262846a94c6757e4994e4b4be90045bc279435d51f468f6874
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it is used to distribute further malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://xn--3bsx3iw22bmot.com/filespath/files/20210916023602.pdf In PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/59312174394.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/kubizibubovo.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_5CCB51F319032BE6.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/molimogis.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/pepijedofew.pdfIn PDF document text
    • http://jinyezi.cn/upload/51405059940.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/91291979329.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/mekotatej.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/12100006191.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/29214074383.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/27988656118.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/29051242404.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/20884508110.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/52432997099.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/jigokifafameninor.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/jabipelixaj.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/26761141847.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9db0e71b1---duxubadaridutokig.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/xexakubuxugibavufimoris.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/nozojajenodogevizutu.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/tuwagamisajir.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tabananedofilazobewarax.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a861c07b3e---78235042719.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/37506261661.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tunadodezabojatewazumosex.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/bixegofitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=next+launcher+full+version+apk+free+downloadPDF 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_off0000bae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE3 15344 bytes
SHA-256: 6483a9d5379bb27d555a826fcb75f394a0981cd1a52b9141226b3273de7be4d8
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 11140 bytes
SHA-256: cc93762e29e1f9e6168e1848b9a055c44d1fd62dcf356a8be446996430feeb72
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1