Malicious PDF — malware analysis report

Static analysis result for SHA-256 2298d1937e9b1cfa…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 00:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2f813dbd15d9f4f3b2934d6e5dfb689f SHA-1: 22205bbba994bcf87e449ee1977c5f1d3bd54dbb SHA-256: 2298d1937e9b1cfaf9b5d4afe0db0f8dfd05a18652c58383613cdf30f4ae6390
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chongtham68.com/app/webroot/uploads/files/94075026626.pdf In PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/44787825969.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/fevesudesatuvogilo.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/sebosuwumaranevukoragis.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/duxegexodesufaj.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/84348438564.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/bazapuperusevemib.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/82299776853.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xolazodexavigofisabep.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/14093199076.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/18177216927.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/ruludefuzen.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/bojetupego.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614203f57279c---31566482136.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/35187760763.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jekerotixujajut.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/40643773859.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/77588751711.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/32775143671.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210907_CE457B996859877B.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mogekimebekubukivabov.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/vopilatebedadiwepir.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/93277715039.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/vegugedufafes.pdfIn PDF document text
    • https://cartolmania.it/file/xujazuleboribikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hack+wpa2+windows+10PDF 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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 10596 bytes
SHA-256: 790fabc5bd6fb1030ee7f0534677b9b3a1fc3872d2ff12e14a86c52b2aa97313
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16984 bytes
SHA-256: be3b5bc9e247b1a8fbf883ad1fe5ca6946845e23c25a07f63cc8c215661b43c6
font_02_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1