Malicious PDF — malware analysis report

Static analysis result for SHA-256 434a40c61247c8c5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 14:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cc481369a28083082f6e68c76f12162 SHA-1: 90e970b39d013870685a352732704725e01b1d15 SHA-256: 434a40c61247c8c53dd2a16ed646f5bd58d6ce80fbc5326d868fe9f4b16040dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or credential harvesting operation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://caythuocdangian.net/images/files/54680935410.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/88745705387.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/91233850298.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/97876471361.pdfIn PDF document text
    • https://istanajp.net/contents/files/41123224345.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210912085821.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/javuvebepivusolowisan.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/61238542044.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/16645718125.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140c42f178a2---10312663101.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/foduwuvali.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/77343645491.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/ximuguratafitesufevabu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f575d1d696---xanulebixesopaxarukik.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/93486878461.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xuvuvitotejogigebisexa.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/zexifinigifitel.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/bujizu.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/82808572923.pdfIn PDF document text
    • https://polandpools.com/contents/files/butam.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/nixavevilap.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/8886929898.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/vojis.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/buputivejamisujawasidali.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nobovokatebo.pdfIn PDF document text
    • http://haki.vn/uploads/files/gonal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apa+7th+edition+citation+for+a+bookPDF 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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 10768 bytes
SHA-256: 16dd669eaacbfa5a7d4aa682ec1e8dda50eb3aa37e8ff9d89e4d4dc0c97d833e
font_01_sfnt_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 14520 bytes
SHA-256: d93622f3ef0ab254e69be98f15a4b8f1de4a1584a13963d9c3915a0c755920b1