Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35563643f519a60…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 15:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f56d2799ae588da8f0e449a89bd3e6fc SHA-1: df8a555ff2cf914532b27b688aba71d4a821ec77 SHA-256: c35563643f519a60a771716ffd5a0a9eeb88f6539375dbea3709bacee345d4ef
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://samtle.net/ckupload/files/dogoxif.pdf In PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/4604184419.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/56194595061.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/44713865930.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/67071699831.pdfIn PDF document text
    • https://ikansambel.com/contents/files/josofudaga.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/15919258995.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/sejiridebizujizoxadegupo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/40a0853bffb6add109bf9e21ca216c25/4921652138.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/xixolakapot.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/64929107932.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/39911241063.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tawanajoluxusodanabi.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/juzijupazufojufulafaze.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/47824205454.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fidona.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/58718112346.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/384587846.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/litogib.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vuvexefaxukifi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/lirituzewapovaji.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/96276226410.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/21212961020.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/45993321464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internal+combustion+engine+books+free+download+pdfPDF 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_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 11332 bytes
SHA-256: 791f933bfb79b245064ffa9b10b9fe78f6aa7d9a2220ae7ab511223861957686
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 17188 bytes
SHA-256: 62c63bfb041a7d61b169e1cdfd7c48dc98af825b1622a2927fe349c5ff32ea3c
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1