Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8c8842ef7d1bd5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 10:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01347771ffd881d0afa3e0d9d70b6d34 SHA-1: c5d548848ddf7968999fe3c3badae3e52fc2f9a1 SHA-256: 0e8c8842ef7d1bd55133bcd3c8d9ec4d14909956a8fd6f2b9b2e5d22c1b611a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to disposable domains and are indicative of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://arerp.kr/data/file///fobanenivor.pdf In PDF document text
    • http://pincodehub.in/userfiles/file/75788527313.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/43194054979.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210911223542.pdfIn PDF document text
    • http://allasclub.com/campannas/file/ditagut.pdfIn PDF document text
    • https://avflash.nl/upload/files/90972840677.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88148368076.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1b46b06---luzaxojubawid.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tolimusuwukorugutifuwef.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/duwikataduvag.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/71856998562.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/11636807256.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/16861981485.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/43458409905.pdfIn PDF document text
    • http://novafish.it/userfiles/files/67781101817.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/nujukevuxilazopazonaf.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/93806641045.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/72587175462.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pilovugowesuworug.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/23146716336.pdfIn PDF document text
    • http://szjg.hu/images/file/wazazon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=far+cry+5+apk+download+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_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 10616 bytes
SHA-256: 76877900f8142af1473cdc0ef1d0deeadf44dcdc94e92d700e35fca311220c60
font_01_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 17672 bytes
SHA-256: a00f099d3fdfc38d102244389fa62c5ab7adcf2e8a0f03fb792fcf0dd0eee4f4

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