Malicious PDF — malware analysis report

Static analysis result for SHA-256 178c90401fee3d3c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 21:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b93b281945b3459102b78ba91965955e SHA-1: 2c073a3718012678946a2b5e8b9a2be71070ecb3 SHA-256: 178c90401fee3d3c46e0464d32c189adb6938a50c1c6d5c97af03fcee2368023
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garnet-medical.com/userfiles/files/94624278970.pdf In PDF document text
    • http://kingsap.com/file_media/file_image/file/73265137525.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/70906397126.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/28947420965.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rapagesimirodawumupa.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/tewoted.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/59056915033.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/tilewiki.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/dodul.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/wetefikudufe.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/tewidoda.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/riwiwugulevibefon.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/21627694358.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/lizop.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613000f07ddb1---lefog.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2458513---87128546508.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905223413.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/63334351509.pdfIn PDF document text
    • http://greenglobepms.com/uploads/buximakamibux.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/dujenemok.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/74490625214.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/favolodano.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/faladijuzepeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ps+touch+update+version+apkPDF 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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 10824 bytes
SHA-256: fa3e1c095482751c54a20f6a963aaea575a28383c6426a83d19c1dc2e1967c41
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 17892 bytes
SHA-256: 2d1aee523a33dce8a5f8e90bfba720a76b6b2a9b9109875d2a7e04f88b6f56e6